Hi experts in ale what is change pointers technique , how we will use ,

hi experts in ale what is change pointers technique , how we will use ,   & when plz explain

Hi,
Refer the  Below links
[http://articles.techrepublic.com.com/5100-10878_11-1048973.html|http://articles.techrepublic.com.com/5100-10878_11-1048973.html]
[http://abapprogramming.blogspot.com/2008/01/ale-change-pointers.html|http://abapprogramming.blogspot.com/2008/01/ale-change-pointers.html]
Regards,
SB

Similar Messages

  • What are change pointers

    What are change pointers?
    where do we process them,
    where do we configure them
    and what is its fuinctionality
    please advice
    Edited by: kittu reddy on Feb 11, 2008 5:02 AM
    Edited by: kittu reddy on Feb 11, 2008 5:03 AM

    hi,
    Applications which write change documents will also try to write change pointers for ALE operations. These are log entries to remember all modified data records relevant for ALE.
    Most applications write change documents. These are primarily log entries in the
    tables CDHDR and CDPOS.
    Change documents remember the modified fields made to the database by an
    application. They also remember the user name and the time when the modification
    took place.
    The decision whether a field modification is relevant for a change document is
    triggered by a flag of the modified field’s data element. You can set the flag with
    SE11 by modifying the data element.
    For the purpose of distributing data via ALE to other systems, you may want to
    choose other fields, which shall be regarded relevant for triggering a distribution.
    Therefore R/3 introduced the concept of change pointers, which are nothing else
    than a second log file specially designed for writing the change pointers which are
    meant to trigger IDoc distribution via ALE.
    So the change pointers will remember the key of the document every time when a
    relevant field has changed.
    Change pointers are then evaluated by an ABAP which calls the IDoc creation, for
    every modified document found in the change pointers.
    The Change pointers are written from the routine CHANGEDOCUMENT_CLOSE
    when saving the generated change document. So change pointers are automatically
    written when a relevant document changes.
    The following function is called from within CHANGEDOCUMENT_CLOSE in order to write the change pointers.
    CALL FUNCTION 'CHANGE_POINTERS_CREATE'
    EXPORTING
    change_document_header = cdhdr
    TABLES
    change_document_position = ins_cdpos.
    Activation of change pointer update :
    Change pointers are log entries to table BDCP which are written every time a transaction modifies certain fields. The change pointers are designed for ALE distribution and written by the function CHANGE_DOCUMENT_CLOSE.
    Change pointers are written for use with ALE. There are ABAPs like RBDMIDOC
    which can read the change pointers and trigger an IDoc for ALE distribution.
    The change pointers are mainly the same as change documents. They however can
    be set up differently, so fields which trigger change documents are not necessarily
    the same that cause change pointers to be written.
    In order to work with change pointers there are two steps to be performed
    1) Turn on change pointer update generally
    2) Decide which message types shall be included for change pointer update
    R3 allows to activate or deactivate the change pointer update. For this purpose it
    maintains a table TBDA1. The decision whether the change pointer update is active
    is done with a Function Ale_Component_Check
    This check does nothing else than to check, if this table has an entry or not. If there is an entry in TBDA1, the ALE change pointers are generally active. If this table is empty, change pointers are turned off for everybody and everything, regardless of the other settings.
    The two points read like you had the choice between turning it on generally or
    selectively. This is not the case: you always turn them on selectively. The switch to
    turn on generally is meant to activate or deactivate the whole mechanism.
    The change pointers which have not been processed yet, can be read with a function
    module.
    Call Function 'CHANGE_POINTERS_READ'
    The ABAP RBDMIDOC will process all open change pointers and distribute the
    matching IDocs.
    When you want to send out an IDoc unconditionally every time a transaction
    updates, you better use the workflow from the change documents.

  • Position data not getting ALEd correctly through change pointers

    Hi All,
    When Posiiton is updated in One system, it gets transfers to another systems through ALE/IDOCs using change pointer method.
    when a new holder is assigned to the position in system A,  the updated data is not getting tranfered to system B.
    All the ALE settings are correct, background jobs are scheduled correctly for the change pointers.
    How ever the updated position data is not getting transfered to system B.
    The IDOCs are faling with message " Relationship starting from 01O XXXXX impossible - 01S XXXX does not exist/is not active".
    Please let me know how to over come this error and tranfer the posoition data when ever it is changed.
    Thanks & Regards,
    Preethi G

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                dd_indx_id       TYPE string .
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            wd_this->count_sysdel = wd_this->count_sysdel + 1.
            wd_this->count_dd_sys = wd_this->count_dd_sys + 1.
            CONCATENATE dd_indx_id wd_this->count_dd_sys INTO dd_indx_id.
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    here lv_node is the name of ur node , I am using count_sysdel of type NUM and concatenate statement
    to provide unique names to the generated node.
    u cn declare it under the attributes tab .
    u can have dd_indx_id = 'DD_1' and increment count each time using
    wd_this->count_dd_sys  which is another counter .
    do revert back if u need any assitance ,it shud help .
    rgds,
    amit

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  • IDOC Change pointers   is table BDCPV still used nowadays

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  • What is availability check concept  how it is used in SAP

    hi friends,
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    Availability Check in Sales and Distribution Processing 
    There are three types of availability check:
    •     Check on the basis of the ATP quantities
    •     Check against product allocation
    •     Check against planning
    In Customizing, you determine whether an availability check is to be carried out against the ATP quanitity or against planning. The check against product allocations is controlled in the material master and elsewhere in the system.
    Check on the Basis of the ATP Quantities
    The ATP quantity (ATP = Available To Promise) is calculated from the warehouse stock, the planned inward movements of stock (production orders, purchase orders, planned orders) and the planned outward movements of stock (sales orders, deliveries, reservations). This type of check is performed dynamically for each transaction, taking into account the relevant stock and planned goods movements with or without replenishment lead time. Planned independent requirements are not taken into account here.
    Check against Product Allocation
    Product allocation facilitates period-based distribution of products for certain customers or regions. As of Release 3.0F, you can carry out an availability check against product allocation. This ensures, for example, that when production is low, the first customer does not get the full amount, resulting in following sales orders not being confirmed or being confirmed far too late.
    Check against planning
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    Controlling the Availability Check in Sales and Distribution Processing 
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    General Control Features
    The following control elements need to be maintained in Customizing and in the material master record:
    •     Strategy group
    The allowed planning strategies (main strategy and further possible strategies) are combined in the strategy group. As of Release 3.0, the strategy group is specified in the material master record in the MRP 1 Screen. In Customizing, strategy groups are assigned, dependent on plant, to MRP groups. If the strategy group is missing in the material master record, it is determined on the basis of the MRP group, if it has been maintained.
    Up to Release 3.0, the strategy group is determined on the basis of the MRP group
    •     MRP group
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    •     Planning Strategy
    The planning strategy specifies the requirements type for planning and customer requirements. This represents the decisive control feature for the interaction between Production Planning and Sales and Distribution.
    •     MRP type and item category
    If no requirements type is found using the planning strategy, the system tries to determine a corresponding requirements type on the basis of the MRP type and the item category.
    Until 3.0C, determination of the requirements type via planning strategy has taken priority. This is not always the best option, however, as the following example will show. A requirements type is determined for a material, which causes availability to be checked against planning. In consignment stock processing, however, availability should be checked against stock. Until 3.0C the availability check had to be deactivated in these cases. As of Release 3.0C, you can determine how the requirements type is to be determined for each transaction by maintaining the Source field in Determination of requirement types using transaction in Customizing.
    •     Requirements type
    The various requirements are identified by their requirements type. The requirements type refers to the requirements class and its control features.
    •     Requirements Class
    The requirements class contains all control features for planning such as relevance for planning, requirements planning strategy and requirements consumption strategy. In addition, it is specified at a global level whether an availability check is to take place for the material in the sales and distribution documents on the basis of the ATP quantity (ATP = available to promise) and whether requirements are to be passed on. A finer degree of control can be obtained for sales documents using the schedule line category.
    Control Features Specific to Sales and Distribution
    The following SD-specific control features need to be maintained in Customizing:
    •     Checking group
    The checking group controls whether the system is to create indivdual or collective requirements in sales and shipping processing. In addition, a material block for the availability check with transfer of requirements can be set here. The checking group can also be used to deactivate the availability check. This option was created especially for the assembly order so that when the bill of material is exploded in the assembly order, the individual components, if necessary, can be classified as non-critical parts as far as procurement is concerned.
    The checking group specifies in combination with the checking rule the scope of the availability check. It is proposed in the material master record on the basis of the material type and the plant, and copied into the sales and distribution documents.
    •     Checking Rule
    You use the checking rule to control the scope of the availability check for each transaction in sales and distribution. You also specify whether the check should be carried out including or excluding replenishment lead time. The individual checking rules define by transaction, which stock and inward and outward movement of goods should be taken into account for the availability check.
    •     Schedule line category
    You can control with the schedule line category whether an availability check and transfer of requirements should be carried out in the sales documents. The possible settings for this at schedule line level are dependent on the settings in the requirements class which is determined from the requirements type of the material.
    •     Delivery item category
    The delivery item category can be used to control whether an availability check takes place in deliveries.
    Prerequisites
    An availability check can only be carried out if the following prerequisites have been fulfilled:
    •     The control elements described above for the availability check must be maintained in Customizing for Sales and the relevant assignments made to the sales transactions
    •     The availability check must be switched on at requirements class level and - for the availability check in the sales documents - at schedule line category level
    •     A requirements type must exist by which the requirements class can be found
    •     A plant must be defined. It can either be proposed from the customer or material master record or can be entered manually in the document.
    •     A checking group must be defined in the material master record on the Sales/plant data screen in the Availability check field
    Timing of the Availability Check in Sales and Distribution Processing 
    When you create an order, the system determines the required materail availability date on the basis of the customer’s requested delivery date. On this date, you must begin picking, packing, labeling, and loading the goods. Therefore, this is the date of significance for requirements planning on which the availability should be checked.
    The following data is required for determining this date:
    •     Route from the shipping point to the ship-to party location
    •     Shipping point from which the goods are issued
    •     Loading group from the material master record
    •     Weight group determined from the order using the order quantity
    Scheduling
    This data, which you have already entered in the system, means that scheduling can occur automatically. Since scheduling is carried out backwards from the requested delivery date, it is also called backward scheduling. If backward scheduling determines that the preparation for the shipping activities should have been started already to meet the customer's requested delivery date, the system then starts forward scheduling automatically from the current date.
    Scope of the Availability Check in Sales and Distribution Processing 
    The following elements can be included in the availability check:
    •     Stock
    o     safety stock
    o     stock in transfer
    o     quality inspection
    o     blocked stock
    •     Inward/Outward movement of goods
    o     purchase orders
    o     purchase requisitions
    o     planned orders
    o     production orders
    o     reservations
    o     dependent reservations
    o     dependent requirements
    o     sales requirements
    o     delivery requirements
    Requirements in sales and distribution (sales requirements and delivery requirements) result from all transactions which forward a requirement to Materials Management (MM) or to Production Planning (PP). For example, this could include sales orders or deliveries and quotations as well. Sales and distribution requirements reduce existing stock or inward movements of stock on the material availability date to ensure that other outward movement of stock elements cannot access the quantity reserved in this way.
    Requirements relevant for Sales and distribution are created in Sales and Distribution, whereas other elements in this list are created in Materials Management or in Production Planning.
    Defining the Elements to be Included in Check
    A checking rule is assigned to each transaction. This rule in combination with the checking group controls the scope of the availability check. You can use the checking rules in Customizing for Sales to specify for the various transactions which of the elements listed above should be included in the availability check.
    For trading goods it does not make sense to include planned or production orders, for example, in the availability check. However, for products manufactured by your company these orders should be included in the check.
    For transactions such as make-to-order production, consignment or returnable packaging processing that create special stock, the availability check is performed against special stock.
    If it is defined by the checking rules that both sales and delivery requirements are taken into account in the availability check in sales documents but only delivery requirements are taken into account in the availability check in deliveries, there is a danger that quantities reserved in the sales documents are considered to be available by the availability check in the deliveries. This can lead to sales documents becoming backlogged.
    Reactions to the Availability Check in Sales Documents 
    If the goods ordered by the customer are not available on the requested date, the system branches automatically during sales document processing to a further screen where delivery proposals are offered for selection. The system determines these proposals on the basis of the availability situation. This screen also provides you with information on the scope of the check, the current ATP quantity, and the availability situation across all plants.
    Availability Control
    On the Availability Control screen, you can choose between the following delivery proposals:
    •     One-time delivery on the requested delivery date
    In this section, the system checks whether the requested delivery date can be kept to. If stock of the material is available to make a delivery on the requested delivery date, the stock quantity is confirmed here. If there is no stock available, confirmed quantity zero is displayed.
    To copy this data into the sales document, select Edit One-time delivery.
    •     Complete delivery
    In this section, the system checks whether there will be sufficient stock for complete delivery at a later date:
    o     If there is sufficient stock available at a later date to cover the required quantity in the sales document, the system proposes the date here.
    o     If the system determines that complete delivery cannot be made at a later date, no date is proposed in this section.
    When availability is checked including replenishment lead time, the date which is proposed in this section is the date on which the replenishment lead time period ends if the stock before the end of replenishment lead time does not cover the order quantity.
    When availability is checked excluding replenishment lead time, the system bases its calculations on the stock and the planned inward movements of stock.
    To copy this data into the sales document, select Edit Complete delivery
    •     Delivery proposal
    In this section, the system checks whether and for which dates partial deliveries can be made. Partial deliveries are displayed for different dates. These dates are based on the planned inward and outward movements of stock.
    During an availability check which takes replenishment lead time into account, the date on which replenishment lead time ends is displayed if insufficient stock means that no partial deliveries can be made before replenishment lead time ends.
    During an availability check which does not take replenishment lead time into account, the system displays the dates on which partial deliveries can be made with the available stock.
    To copy this proposal into the sales document, select Edit Delivery proposal
    The dates displayed in the sections complete delivery and delivery proposal are determined from the material availability date using forward scheduling and represent actual delivery dates.
    Availability Across Plants
    You can display the availability situation in the various plants for which a material is maintained. To do this, proceed as follows:
    1.     Select Goto Other plants on the availability control screen.
    The dialog box Plant Selection appears. All plants for which the material is maintained are displayed.
    2.     Mark the plants in which you want to check availability and select Check plants.
    You reach the Availability Check: Overview screen. The requirements quantity and the quantity which could be confirmed as well as some additional information is displayed in a separate line for each plant you selected.
    3.     If you require detailed information on the availability check for a particular line, select the relevant line and select Edit Check availability.
    You reach the Date proposals dialog box where the detailed data is displayed.
    4.     You can select a plant with sufficient quantity for confirmation to be copied automatically into the Overview screen. Select the appropriate line and select Edit Copy plant.
    Using the user exit USEREXIT_PLANT_SELECTION in the Include LV03VFZZ you can make a preselection of the allowed plants. If you use this option, the Plant selection dialog box does not appear and the availability check is performed immediately for the allowed plants. If, on the basis of information resulting from the availability check, you want to deliver from a plant other than the one specified in the item, you must at present enter this plant manually in the item. In a later release, however, you will be able to select the plant directly from the list of plants.
    Displaying the ATP Quantities
    If you want to display the current ATP situation on the availability control screen, select Goto Availability overview.
    Displaying the Scope of the Check
    If you want to display the scope of the check (stock and inward/outward movements of goods taken into account during the availability check) from the availability control screen, select Goto Scope of check.
    Delivery Agreements in the Customer Master Record
    A customer may react in different ways to the fact that a complete delivery can not be provided for the required delivery date. You can define in the customer master record, the way a customer reacts to the inability to meet the requirements represented by the key data.
    •     The customer wants complete delivery of all items by the requested delivery date or at a later date.
    The complete delivery indicator is copied into the sales document from the customer master record. To find it, select Header Business data on an overview screen or a header screen. You find the indicator in the Shipping section.
    If the complete delivery indicator is set in the sales document, the individual items are automatically correlated when the document is saved if the schedule lines exist for various dates (that is, a delivery group is automatically created for the sales document items and the latest delivery date within this group becomes the group delivery date). For further information on delivery groups, see  Combining Sales Document Items for Delivery.
    •     The customer only allows a certain number of partial deliveries for each item.
    The partial delivery indicator and the number of partial deliveries are copied into the sales document item from the customer master record. To find the indicators:
    1.     Go to the Business Data screen for this item.
    2.     Select Edit Shipping details.
    The indicators are found in the Shipping section.
    Performing the Availability Check Again
    Usually, an availability check is only performed when a sales document is created. If quantities or dates are changed in the document and availability needs to be checked again, the check is performed again automatically . However, you can also initiate an availability check manually.
    Automatic Checks
    In the following situations, a new availability check is automatically carried out:
    •     Quantity change
    •     Date change (requested delivery date, material availability date)
    •     Change to the fixed data
    •     After new delivery scheduling (for example, the route or shipping point has been changed)
    •     Change of plant
    •     Change of storage location or batch
    •     Removal of blocks which affect requirements
    •     Removal of reasons for rejection
    Initiating a Check Manually
    In the sales document, you can initiate a new availability check manually. If you want to perform an availability check for all items in a sales document, select Sales document Check availability on the header screen. If you want to check availability for an individual item, select Edit Item availability.
    Fixing Quantities and Dates in Sales Documents 
    If the availability check for an item determines that the item cannot be delivered fully on the requested delivery date, and, as a result one or more schedule lines have to be created for later delivery dates, the customer can decide whether to accept these delivery dates and quantities.
    You can record the customer's decision either by setting an indicator in the Fixed date and qty field or by leaving this field blank. The field is displayed both on the schedule line overview screen and on the availability screen.
    Customer Accepts the Schedule Line Proposal
    If the customer accepts the schedule lines which are proposed by the system, mark the Fixed date and qty field. The system then transfers the requirements for the schedule lines to material requirements planning.
    Customer Requires Goods Earlier
    If the customer requires the goods earlier than the date that the system can confirm after the availability check, leave the Fixed date and qty field blank. The system then only passes on the requirements for the requested delivery date and does not take the quantities and dates confirmed by the system after the availability check into account. In this case, it is assumed that the requested delivery date can be kept to because, for example, additional production capacity may become free. The system only confirms the sales order once the entire order quantity can be delivered on the requested delivery date. In the subsequent delivery processing, the sales order is only considered to be completed when the entire order quantity has been delivered or when all partial delivery agreements have been fulfilled.
    A fixed item is considered to be completed once the entire confirmed quantity (which can be smaller than the originally requested order quantity)has been delivered. Therefore, it does not make sense to fix the confirmed quantity to 0 as the item is considered to be completed from the start.
    During rescheduling, the fixed quantities and dates are no longer taken into account.
    Blocking Confirmation of Quantities in Sales Documents 
    In Customizing, using Block transfer of requirements by delivery block, you can specify that certain delivery blocks in the sales document header also block the confirmation of order quantities.
    If you enter such a delivery block in a sales order header, the system confirms the available quantity to show you the delivery options. If you save the document, however, the confirmed quantities are not saved. Your company could block confirmation for a customer if this customer's credit worthiness was questionable. The sales order in this case is not only classed as unconfirmed, it is also blocked for delivery.
    Thus, no stock is reserved. The stock is still available for other customers. Although the order quantities are not confirmed, the system still transfers the requirements to material requirements planning. It is assumed that the delivery block will be removed at some point. The automatic transfer of requirements means that the order quantity can be confirmed at a later point in time
    Source: SAP Library
    Hope this is of some help.

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