Combining multiple requisition lines with different descriptions into Single PO Line -

Hi

WE have a requirement where buyer combines multiple requisition lines into Single PO line during the consolidation. Even though it sounds a logical process, there is a glitch we noticed.. we have huge user base and use only expense based requisitions (Iprocurement - expense based - Non catalog requisition) and the user enters the description in their own way. When the buyer combines, he has a hard time in combing them to create a PO, as the system expects the description to match for all the lines he is combining. Is there a way we can override this validation.. eg