Prevent PO to populate price from last po price

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Hi Expert,

In purchasing info record, I have this condition:

Valid from 15.04.2013 to 30.04.2013

PB00 : 1 USD

The price is not available yet for May.

I want to have the result like this:

When I create PO with exactly the same vendor, material, plant and purch.org, but the PO date is 01.05.2013, I want the system to block the PO since the PO date is not met the validity date in info record.

I know this is the standard, but the problem is :

I forgot to remove the check-mark in info-update field in my last PO, so when I create PO with exactly the same vendor, material, plant and purch.org, but the date is 01.05.2013, the system populates the price from the last PO.

This condition causes the PO to get the wrong price.

Since then, every time I create PO, I remove the check-mark in info-update field, but I still don't have any idea how to prevent this PO from populating the last PO price, if the validity period is not met.

Please help.

Best regards,

Amri