Query about SAP locks /enqueue objects

I have created an lock object for a bespoke table which has 5 key fields. For arguments sake let's call them
WERKS QMGRP QMCOD OTGRP OTEIL.
The problem I have is the following:
User 1 has a house profile that can access the following data:
WERKS QMGRP QMCOD OTGRP OTEIL
9026 HOUSE CUST
User 2 has a functional profile which gives them access to the following:
WERKS QMGRP QMCOD OTGRP OTEIL
9026 HOUSE CUST
9026 HOUSE CUST   CS    C001
9026 HOUSE CUST   CS    C002
I am building a front-end to the table to enable the users to change data associated with these keys. My problem is the following. If User 2 locks the entries,(s)he has access to first, the user 1 entry will be locked to changes, which is correct. If, however, user 1 locks its entry first, <b>all</b> of user 2's entries are locked even though only the first entry is allowed to be accessed by both. I think this is happening because the SAP lock object does not recognise '   ' '    ' as a separate value to 'CS' 'C001'. It thinks because 9026 HOUSE CUST '   ' '    ' is locked, then the other entries should be locked because they share 9026 HOUSE CUST from the key, even though there are other values in the key following 9026 HOUSE CUST.
What I want is if user 1 locks its entry first, then only the entry that matches the key totally for user 2 is locked, leaving the other 2 entries to which user 2 has access free to be edited.
Is there a way I can get the SAP lock object to recognise this eitehr by changing the enqueue function module or by the way I cal the enqueue object or not?
Any help would be appreciated.
Hope this makes sense
Larissa

Hi Larissa,
As far as I know, You cannot change generated enqueue function module. The other way as i think might work would be to create a new FM and do manipulation (for space to be changed as some other value) before calling this generated Enqueue FM.
Hope this helps.
Regards,
Vicky
PS: Award points if helpful

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Hi All,
should the sap locks ENQUEUE/DEQUEUE need to be used for all the updation/insertion of records ino the table?
Please confirm.Should this locking technique be used even for insertion of records into the table?
Regards,
Pra.

Hi,
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
SAP Provide three type of Lock objects.
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   protects read access to an object. The read lock allows other transactions read access but not write access to
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works like a write lock except that the enhanced write lock also protects from further accesses from the
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You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.
Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.
Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.
Technicaly:
When you create a lock object System automatically creat two function module.
1. ENQUEUE_<Lockobject name>. to insert the object in a queue.
2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.
You have to use these function module in your program.
Hope this will give a basic idea.

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Hello,
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Please reward with points if helpful

Re: what is difference between sap locking and database locking

hi,
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REPORT zlock .
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Hi Paluri
Here is the difference between SAP locks and Database locks, i will try to find the solution to your code.
Regards
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Database Locks: The database system automatically sets database locks when it receives change statements (INSERT, UPDATE, MODIFY, DELETE) from a program. Database locks are physical locks on the database entries affected by these statements. You can only set a lock for an existing database entry, since the lock mechanism uses a lock flag in the entry. These flags are automatically deleted in each database commit. This means that database locks can never be set for longer than a single database LUW; in other words, a single dialog step in an R/3 application program.
Physical locks in the database system are therefore insufficient for the requirements of an R/3 transaction. Locks in the R/3 System must remain set for the duration of a whole SAP LUW, that is, over several dialog steps. They must also be capable of being handled by different work processes and even different application servers. Consequently, each lock must apply on all servers in that R/3 System.
SAP Locks:
To complement the SAP LUW concept, in which bundled database changes are made in a single database LUW, the R/3 System also contains a lock mechanism, fully independent of database locks, that allows you to set a lock that spans several dialog steps. These locks are known as SAP locks.
The SAP lock concept is based on lock objects. Lock objects allow you to set an SAP lock for an entire application object. An application object consists of one or more entries in a database table, or entries from more than one database table that are linked using foreign key relationships.
Before you can set an SAP lock in an ABAP program, you must first create a lock object in the ABAP Dictionary.

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