CTM Backward Scheduling

Hi Guru's,
I'm quite new to SNP and CTM so I need help on the CTM process. I have read and search on how the Backward scheduling works for CTM and what are the setp-up. Below is the scenario.
For example, I'm running CTM with Finite scheduling so it will take into consideration the Capacity of the resource. The capacity of the resource per week is 150, but on week 7 the total demand is 400. Given that week 5 and 6 already have capacity of 100 and 100 respectively. May I know how long does it takes for CTM to consider rescheduing the other demand backwards (week 4, week 3 etc.) ? Where is the backward scheduling for CTM set-up? Please note that we are not using forward scheduling.
Thanks a lot,
Raymond

Hi Raymond
Your first Q: How long it takes to schedule it back--- It depends on many factorsdo you allow lateness/shortage--Order Creation Frame,Maximum Lateness/Earliness allowed,overall leadtime etc...(//ctmcust1)/MAT1 Settings
Second Q-where you set scheduling direct-You set the scheduling direction in CTM Profile (strategies tab)
But,if that could not be done,CTM switches automaticallly to 'Forward' irrespective of the setting..
Thanks and Regards
Suresh
NB:Please reward answer if it is helpful/useful

Similar Messages

Calculation of start date with backward scheduling

Dear all,
I am facing an issue related to backward scheduling. I have requirement in which whenever backward scheduling is used, system should calculate from last activity to first for calculation of schedules which is fine. But when running scheduling i am giving finish date as input and system is always using start date as current date and not calculation last date from last. For example if i input finish date as 15 feb 2015, and there is only one activity of 15 days, system should count start date from 1 feb 2015. Please help me how i can achieve this, currently its always putting start date as current date.
My current settings are--
Project definition- WBS Scheduling profile- Backward scheduling
                              scheduling scenario- Free scheduling
Network-      Planning type- basic dates
                    Scheduling type- Backward
Please help.
Thanks

Dear all, this issue is resloved. Reason was that by default i am using forward scheduling for all project but in case of backward scheduling, user change schedule type at project definition and network. I was removing start date and putting finish date and running scheduling. Missing step from my side was i need to first copy date from top to down than run scheduling again.
Thanks.

Basic finish date earlier than basic start date while backward scheduling

I am encountering an issue where in when I am selecting backward scheduling for a process order and I am entering the Basic finish date, afte which system is giving me a Basic startdate which is after the basic finish date.
For eg:- When i give the basic finish date as 08.12.2011, system is giving me basic start date as 09.12.2011
I have checked the recipe of the material. In the recipe one major flaw that i found out was that all the activity timings were maintained as 0. But when i created a similar scenario in the testing client, i am not getting the issue.
Please help.

Hi,
Check what is maintawined in number of days the start day is allowed to be in the past in scheduling parameters of the order type, in OPU3. If there is an opening float defined in schedule margin key of the order, and concerning this float backward scheduling finds a start date which falls into past, lead time scheduling will automatically switch to forward scheduling starting from today. 9.12.2011 could have been deducted this way. Also check the factory calendar if days upto 9.12.2011 are defined as working days.
Regards.

Planning Run - Enhanced Backward Scheduling Error

Hi SAP Expert,
I encountered planning run error "Heuristic terminated due to a possible endless loop" after I run the planning run via transaction /SAPAPO/CDPSB0 - Production Planning Run with heuristic "Enhanced Backward Scheduling".
Do anyone have any idea on it?
Thanks.
Regards,
Hooi Chia

Hi All,
This issue had been resolved. I'm now close this issue.
Regards,
Hooi Chia

Forward & Backward Scheduling

Hi,
When i m Creating SO for MTS(Strategy 10) scenario its not confirming the date in schedule lines.
but is confirming date in schedule lines in MTO(Strategy 20) scenario.
why is it so?
ie. system not doing Forward scheduling in MTS???
Regards,
Amol

Hi
t code OVLY
see for yor doc type backward scheduling is ticked
If ticked then it performs only backward and stops and doesnt do forward
If not ticked then it does both
Backward scheduling first and suppose that fails it does forward scheduling
Remove the tick and try
Menu path
Img-logistics executionshipping-basic shipping functions-scheduling-delivery scheduling and transportation scheduling---define scheduling by sales doc type
Regards
Raja

Backward Scheduling Issue

Hi,
I have an issue when SAP performs backward scheduling to get the production order finish dates.
As an example, if the Basic finish date is Tuesday 01/27/2009 (00:00) then when SAP performs backward scheduling it comes up with the following dates & Times:
Basic Start Date - 01/22/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2008
Scheduled Finish Time - 24:00
Scheduled Start Date - 01/22/2008
Scheduled Start Time - 13:17
If the Basic finish date is Monday 01/26/2009 (00:00) then when SAP performs backward scheduling it comes up with the following dates & Times:
Basic Start Date - 01/21/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2008 instead of 01/19/2008
Scheduled Finish Time - 00:00   instead of 24:00
Scheduled Start Date - 01/21/2008
Scheduled Start Time - 13:17
Could someone please explain as to why this is happening?
Thanks,
JP

Sorry about that. All the dates are in 2009. Here is the updated information
Case 1:
Basic finish date is Tuesday 01/27/2009 (00:00)
Basic Start Date - 01/22/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2009
Scheduled Finish Time - 24:00
Scheduled Start Date - 01/22/2009
Scheduled Start Time - 13:17
Case 2:
Basic finish date is Monday 01/26/2009 (00:00)
Basic Start Date - 01/21/2009
Basic Start Time - 00:00
Scheduled Finish Date - 01/26/2009     instead of 01/19/2009
Scheduled Finish Time - 00:00             instead of 24:00
Scheduled Start Date - 01/21/2009
Scheduled Start Time - 13:17
Saturday & Sunday are holidays. I have checked the calendar and it is not the issue. I would appreciate it if you could help me in this as this problem is driving me crazy
Thanks,
JP

Backward scheduling in sales order

Hi all,
I have 2 routes maintained which should be determined by different shipping conditions. Let's name them as Route A with transit time 4 days and Route B with transit time 2 days.
When creating sales order, the backward scheduling takes place. To my understanding, in case the material available date is calculated as in the past, forward scheduling will take place.
My question is - I have 2 routes with different transit time. Is it possible to make the backward scheduling checking all available routes (in my case, ignoring the shipping condition) before start the forward scheduling?
Thanks in advance.
Cheers, Kenneth

This is how the system works:
the route is determines in FM SD_ROUTE_DETERMINATION. this is reached via the following call stack:
SAPL0VRF FUNCTION SD_ROUTE_DETERMINATION
SAPFV45P FORM VBAP-ROUTE_ERMITTELN
SAPFV45P FORM VBAP-VSTEL_ERMITTELN
SAPFV45P FORM VBAP_FUELLEN
SAPMV45A MODULE (PAI) VBAP_FUELLEN
As you know, shipping conditions are used as a criteria to find a route.
So lets say:
Shipping Conditions A (Air) ---> Route 1 will be determined
Shipping Conditions T (Truck) ---> Route 2 will be determined
Route 2 gets determined. Later, Function SD_SCHEDULING will be called. The following call stack reflects this:
SAPLV03C FUNCTION SD_SCHEDULING
SAPFV45V FORM VERSANDTERMINIERUNG_NEU
SAPFV45V FORM MVERF_AUFBAUEN_WMENG
SAPFV45V FORM MVERF_AUFBAUEN
SAPFV45V FORM VERFUEGBARKEIT_PRUEFEN
SAPFV45V FORM BESTAND_BEDARF_ABGLEICHEN
SAPFV45P FORM VBAP_BEARBEITEN_ENDE_VERFUEGB
SAPFV45P FORM VBAP_BEARBEITEN_ENDE
SAPMV45A MODULE (PAI) VBAP_BEARBEITEN_ENDE
The call of function SD_SCHEDULING looks like this:
call function 'SD_SCHEDULING'
   EXPORTING
     if_schedule_direction   = v03c_backwards
     if_schedule_shipping    = us_vstrm
     if_schedule_transport   = us_trtrm
     if_shipping_point       = us_vstel
     if_weight_group         = us_grulg
     if_loading_group        = us_ladgr
     if_transport_route      = us_route <<<<<<<<<<<<<<<
us_route contains the route that is determined in FM SD_ROUTE_DETERMINATION.
So only 1 route will be passed to SD_SCHEDULING. In this example, use_route = "2" (Route 2).
My understanding of your issue is that you may have a requested delivery date = 10th April (for example)
10th - 4 days = 6th, a date in the past so system must do a forwards scheduling, and then we inevitably have a later confirmed delivery date. However, before you have the system do a forwards scheduling, you want the system to see if the requested delivery date of April 10th can
be reached with route 1.
10th - 2 days = 8th, so there is no need to execute the forwards scheduling as the customers requested delivery date can be met
It sounds like a reasonable request to me (Route 2 could be cheaper and meet customer's delivery date but if it cant be reached, then use route 1 as you will get goods to customer on time even if it is more expensive), but I do not think it is easily achieveable. The ECC system is just not as clever as that. Maybe the APO scheduling offers some more flexibility regarding this? The ECC system simply uses the route (i.e. transit time of route) as part of the initial backwards scheduling. If dates in the past, it will switch to forwards scheduling.
There is no method by which it will not switch to forwards scheduling if there is another route available. It cannot do this because as far as FM SD_SCHEDULING is concerned, there is only 1 relevant route.
I am not even sure if this is possible via a user exit. The problem is preventing the forwards scheduling in the case of route 2 resulting in past dates. There is definitely no user exit to do this within SD_SCHEDULING. And then there is the possibility of route 1 determining past dates. In the case of both routes determining past dates, which route should be used. So I do not think there is any possibility to so this from within the scheduling function.
Maybe you could implement your own "rough" scheduling logic in EXIT_SAPL0VRF_001. This exit is called in FM SD_ROUTE_DETERMINATION and allows you to determine your own route. And then this route will later be passed to the standard scheduling function. This would be a fairly significant development effort though.

Backward scheduling not working

Hi Gurus,
I have maintained the Backward scheduling for a new order type as per below in OPU3
in detailed scheduling tab I have ticked the scheduling indicator also generate capacity requirements
in Adjust scheduling tab I have selected Adjust basic dates,adjust dep. reqmts to operation date.
in scheduling type selected backward scheduling also ticked the indicator Automatic Scheduling and Automatic log
In reduction tab maintained All operations in the order will be reduced and in Max.reduction level maintained Do not reduce.
After that I am creating an order by entering today's date as end date .The start date also showing today's date instead of back date
Please suggest if anything missed
Aravind

Hi Aravind,
Do you mean you want to allow the order to start in the past? If yes, then you need to fill some numbers in "Start in the Past" field in OPU3 as follow:
It's the number of days in which you allow the order to start in the past.
Regards,
Julian

MRP Backward scheduling

Hi Friends,
My client has this year annual budget sales, this needs to be updated in the PIR ( MD61).
Here i have one doubt, say for ex if i enter april09 PIR as 1000 qty ( REM ).Then it should be a Ready for that period i hope.
In that case it is a Backward scheduling,,Where do i need to set this and configure, In OPU5 it is Backward scheduling only..
I tried with the current setup. My FG has 1day Inhouse production and its components ROH has 2 days Delivery time. It means today is 13.03.09, if i run MRP for this FG, My PurcReq has to created in 3 days back only. But here it is not like that, Instead of that IT is showing the Requested mtrl available on 15.03.09..
Please Help me in this..

Hi
As you said, Backward scheduling is working. But the thing is, it is nopt working for My FG material.
FG has one SFG component and this SFG has one ROH component..
If i created PIR for this FG on this day 16.03.09.
ROH Purc.Requ is creating as per my 2 days GR proceTime and 1 day Dly time.
My SFG is starts on 19.03.09. having one day inhouse prd time,
whereas my FG has one day In-house prd time., But it starts on today itself, 16.03.09.Actually it has to start on 20.03.09.
Pl help in me where the config missing

Backward scheduling

We are trying to configure backward scheduling for our SAP system. Suppose the requested delivery date by the customer is 22.07.2011, the goods issue date should be 21.07.2011 as goods should leave the factory before one day in order that it should be received by the customer on time.
This goods issue date is being calculated based on Route, i.e. for route 001 the transit time mentioned in the configuration is 1 day but still system is not displaying the goods issue date 1 day less than the requested delivery date.
Please guide me if I missed anything.

Hi,
You can check whether the route is determined correctly in the sales order and the factory calender of the forwarding agent is maintained in the route in case the shipper calender different from that of the forwarding agent calender.
Regards

In backward scheduling system is asking starting date in planning Boar

In my project i am using backward scheduling ,before going for scheduling i am delete the basic start date of project and network header .then i go to planning board and carrying scheduling now system is give me a popup "start date ".than i maintain the start date and carry the scheduling , in the backward scheduling starting is not required and system is determine starting date also , why system is asking starting date please let me know any configuration changes in Planing board or scheduling parameter.
Regards
Rao

Dear Abdul ,
In opu6 in maintain starting in past 999
and opu6 configurations
adjust basic date -2
scheduling type -backward
start in past -999
and check automatic scheduling,latest staging date
in the control parameter for wbs scheduling also
scheduling type -backward
starting date -999
scheduling method -wbs determine dates
and check-adjust basis date
Regards
Rao

Forward and Backward Scheduling

I have a couple of related questions.
1. Where can I configure if I want Forward/Backward Scheduling in Customization? and if I leave it blank will it do forward or backward scheduling?
2. Does the system not perform backward scheduling if Replenishment Lead Time (RLT) is setup? If yes why?

Hi,
Backward scheduling is the calculation of deadline dates: the arrival time at the customer site is calculated as the earliest
possible goods receipt time at the customers unloading point on the requested delivery date. All four of the delivery and
transportation scheduling lead times are subtracted from the customeru2019s requested delivery date to determine if this date can
be met.
The transit time, loading time, and pick/pack time are subtracted from the customeru2019s requested delivery date to calculate the
required material availability date.
The system calculates backward scheduling as follows:
Requested delivery date minus transit time = Goods issue date
Goods issue date minus loading time = Loading date
Loading date minus transportation lead time = Transportation scheduling date
Loading date minus pick/pack time = Material availability date
Forward scheduling is also done if no product is available on the material availability date calculated by backward
scheduling. The system does an availability check to determine the first possible date when product will be available. This
new material availability date forms the starting point for scheduling the remaining activities. The loading time, pick/pack time,
transit time, and transportation lead time are added to the new material availability date to calculate the confirmed delivery
date.
Regards
Ram

Re : Backward Scheduling

Hi
How to set transit time, Picking time, Packing time for the required delivery date in Backward Scheduling Process.
Thanks
Mani

Dear Mani,
Example of Backward Scheduling for In-House Production
Example Data
Requirements date
25.6. (Friday)
Goods receipt processing time
2 days (workdays)
In-house production time for the material:
6 days (workdays)
Opening period
6 days (workdays)
Workdays = Monday to Friday, no bank holiday
Scheduling
Requirements data minus goods receipt processing time = order finish date
25.6. (Friday) minus 2 workdays = 23.6. (Wednesday)
Order finish date minus in-house production time = order start date
23.6. (Wednesday) minus 6 workdays = 15.6. (Tuesday)
Order start date minus opening period = order opening date
15.6. (Tuesday) minus 6 workdays = 7.6. (Monday)
Example of Backward Scheduling for External Procurement
Example Data
Requirements date
31.10. (Monday)
Planned delivery time of the material
10 days (calendar days)
Processing time for purchasing
1 day (workdays)
Goods receipt processing time
2 days (workdays)
Opening period
10 days (workdays)
Workdays = Monday to Friday
Scheduling
Requirements data minus goods receipt processing time = order finish date (provision date for vendor)
31.10. (Tuesday) minus 2 workdays = 27.10. (Friday)
Order finish date minus planned delivery time minus processing time for purchasing = release date for purchase requisition or order start date of planned order for external procurement.
27.10. (Friday) minus 10 calendar days minus 1 workday = 16.10. (Monday)
Release date minus opening period for planned order = opening date of planned order
16.10. (Monday) minus 10 workdays = 2.10. (Monday)
I hope it will help you,
Regards,
Murali.

Dirrerence between backward scheduling and forward scheduling

hi Friends,
This is madhusudhan i need diff b/w backward scheduling and forward scheduling
plz do the needfull asap

Hi,
Backward scheduling is the calculation of deadline dates: the arrival time at the customer site is calculated as the earliest possible goods receipt time at the customers unloading point on the requested delivery date. All four of the delivery and transportation scheduling lead times are subtracted from the customers requested delivery date to determine if this date can be met.
The transit time, loading time, and pick/pack time are subtracted from the customers requested delivery date to calculate the required material availability date.
The system calculates backward scheduling as follows:
Requested delivery date minus transit time = Goods issue date
Goods issue date minus loading time = Loading date
Loading date minus transportation lead time = Transportation scheduling date
Loading date minus pick/pack time = Material availability date
Forward scheduling is also done if no product is available on the material availability date calculated by backward scheduling. The system does an availability check to determine the first possible date when product will be available. This new material availability date forms the starting point for scheduling the remaining activities. The loading time, pick/pack time, transit time, and transportation lead time are added to the new material availability date to calculate the confirmed delivery date.
Reward points if it helps

CTM and scheduling agreements

Hi
Is it true that CTM does not consider scheduling agreements while planning ? If yes then isnt this a very big limitation on the planning method ? Where can CTM be used then ? I know it helps u proiritize demand than supply and allows fixed pegging. But I am trying to find out where can it be used if it does not consider scheduling agreements ?

Dear DS,
Please include the ATP category of the Scheduling agreement in the CTM profile in the planning scope tab /Demand selection /Supply selection in Order Selection.
and also in supplies tab in categorization profile depending upon the requirement .
Regards,
Srinivas.S

CTM Backward Scheduling

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