PR should generate in the first day of the week

Hi,

In product planning table (/SAPAPO/PPT1) in APO, against requirement PR (Purchase requisition) for externally procured material is created on weekly basis. The view is weekly.

In ECC the delivery/ requirement dats of the component is coming in last day of the week for the PR.

The requirement is to get the requirement/ delivery date of the PR in the first day of the week.

We are usining standard lot size (EX).

I tried with weekly lot size with delivery/ requirement on first half of the period (week). But this is not working.

How to achieve the same?

Thanks in advance.

Regards,

Surajit Das