Need help with ME51N Release Strategy

Hello Everyone,

I have the following scenario that I cannot figure out how to code. We are creating a Purchase Requisition for a Internal Order, we currently have the following levels for the release strategies Account Manager, Grants Office and Purchasing Dept. What we need to do is examine the internal order and if it is in a certain range then show these three levels, if it falls in a different range then we just want to show the Grants Office and Purchasing Dept. I am currently using user exit M06B0002, the exit is executed right before the release strategy tab is displayed, but I cant figure out how to solve my problem. Any help would be appreciated. Thanks.

Gabe