Are your client receiving a PO or generating a PO on a vendor ? If it is for vendor, then, I believe, you will come to know the extent of impurities, only after GR is made. Only during MIRO, the amount can be deducted if required. Having said that, validating at PO level may not be possible. Nevertheless, instead of hard-coding the logic, it is better to maintain those values in tvarvc table and compare at transaction level when the payment is made. This logic can be applied either in a routine or user exit and the advantage of going with tvarvc table is at a later date, if there is a change in Business requirement and if 1000 to 1500 also to be added, you just need to the values in this table, so that the coding logic will take care. On the other hand, if you hard-code, each and every time, you need to touch the code.
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