customize iw13 for Material Descriptions for one time buys

Hello,

I'd like to make a customer report zpmiw13 using iw13. I'd like it to do everything the same as iw13 except I'd like it to get the material description for the one time buys to show up on the report.

I'm pretty sure this has been done before so I was hoping someone has a code sample I could look at to do this.

Somewhere in the code I need to do a select statement to find the Material Description in EKPO(?) when the Material Number field is blank (one time buy = no material master record).

Any help?

Thanks,

Matt