Quantity Rounding at the time of PO

Hi,

In our business we are creating PR from MRP and creating purchase orders by adopting PR's after release.

I have a requirement to round the PO quantity to  a vendor lot size.

For example

When MRP runs, it should create requirements without rounding and when we adopt PR for po creation it rounds the value

eg:

52 qty requirement generate by MRP in PR

After adopting PR quantity , it must round to 100 on purchase order because supplier lotsize is 100.

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I check the rounding value files in MRP1 of material master but it rounds  at PR level which we do not want we want the rounding to start at PO Level.

waiting your replies.

Regards

M.Waqas Khan