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scheduling dates when external operations are in the routing

Hi all,

when I create a production order with Forwards scheduling type, I input the basic start date. Upon scheduling, the basic finish date and the scheduled dates are automatically generated. For example, if I set the basic start date to the 12.12.2016, the scheduled start date is also set to the 12.12.2016. However, if I manually set 13.12.2016 as the basic start date, upon scheduling the system automatically changes the basic start date to 14.12.2016 and sets the scheduled start date also to the 14.12.2016. Now, I know that in OPU3 I can set whether the basic date should be adjusted according to the scheduled date, and this is fine. However, I don't want SAP to change the basic start date to the 14.12.2016 if I absolutely want the production order to start on the 13.12.2016. What I noticed is that the presence of a external operation in the routing influences the scheduling. The external operation has a planned delivery time of 10 days and somehow it seems that the system forces it to start and finish always on a working day (e.g. it never finishes on a weekend). The external operation is the second operation in the routing. When the scheduling is carried out, the timing of the external operation is changed to start and finish always on a working day, but this has also an influence on the start date of the first operation, which gets postponed. I understand that the system does this for optimization reasons. However, is there a way to keep the starting dates from being changed upon scheduling in cases like this one?

Thanks for your help.

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