PR value and PO different

All,
Suppose I raised a PR for a non stock item ( No material code) .
I put price approx. as 1000 and as per this value level , it has gone through the release procedure .
After converting PR to PO , Purchase dept find that the actual value is 50,000.
For value 50,000 , Release matrix for PR is different .
1.So any way is there to restrict this kind of problem , where requestor can put approx value in PR as very less so that it will not go thru actual approval level.?
2. Any tolerance limit we can put in PO for this ?
3.Pls suggest a better way ?
regards,

Hi,
The price on the requisition has to be available for input because the system needs this to check the value against the release strategy.
If you were using material masters for everything then the price would be taken from the std or MAP price from the accounting view and so you could then protect the field and stop people from putting in whatever they want.
BUT if the requisition is for a non material purchase (or for a material with no accounting view) the system HAS to have a value entered manually.
This is of course open to abuse but there are no real alternatives.
If you had a tolerance, what would you be comparing the price they entered against?
So in my experience we have used a simple report that checks all POs created from requisitions daily and highlights any that have a price on the PO that is than X% higher than the price on the requisition. (we exclude material requisitions from it where the price is taken from the accounting view).
This is cjecking after the event but at least there is enough time to intervene and stop the order if there is something wrong.
Steve B

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