MRP is creating duplicate planned orders

[Former Member]

Hi Friends

I observed a surprising problem in MRP run.

E,G; BOM structure is FG1-SFG1-SFG2-R1

Lets say the reqmt date for material code FG1 against a network(project planning) is 15.09.08. So the production order finish date is 15.09.08 & start date is 10.09.08 ( 5 days is routing time). So production order finish date for SFG1 is 10.09.08 and start date is 01.09.08(09 routing time) And so on the dates for production order SFG2 & PR for R1.

Case 1) Now I changed the finish date and start date of SFG2 production order to 10.12.08 & 01.12.08 respectively, So on MRP run system is creating some msg like start date in past, reqmt not covered etc. Here no problem.

Case 2) But if I shift the date of SFG2 to a far long say 11.12.2011 then on MRP run, system is creating extra planned orders for SFG2 to meet the reqmt. So extra PR for R1 too ( one for the old production order another for new planned order) is getting generated.

Why it is like this? Why it is creating 1 more proposal in 2nd case?

Why it is not creating the same extra planned order for case 1 since in both the cases the production orders are in furure date.

Is there any days limit in system? If so how to change the setting? Pls guide

You too can so this test in your system. I checked in 3 different Sap servers/clients. Same problem.

Thanks & regds

[Former Member]

I would like to understand why you want to schedule a subsequent order later than the requirement date of FG1? If you want to reschedule all orders supplying FG1, why don't you just change the requirement date of FG1 and let MRP do the job? In general it's recommended to manipulate on the requirement side rather than of the supply side.

I'm surprised that SAP doesn`t create a new planned order in scenario 1 after u have scheduled the old one future to the initial requirement. scheduling always starts backwards until it is too far into the past and then changes to foreward but should never start in the far future.

[Former Member]

Hi Bernd

Thanks for ur reply.The question is why reschedulling the dependent production orders into a future date. The worry is why it is not creating another proposal if the future date is till next dec2011. It is creating extra planned order only it is beyond that Dec2011. The planning horizon is 999. And these dates of new proposals are within that range.

Can u simulate a same scenarion & try to analyse. Pls note that the production process is MTO with a project.

Thanks & regds

[Former Member]

Closing without solving this.

[Former Member]

Check ur consumption period and Planning horizon

[Former Member]

Hi

Planning horizon is 999. I did not understand the consumption period since we are not using any planning strategy. All requirements are based on project dates.

Thanks & Regds