Default vendor in PO detail condition

Hi guys,

I search in SCN and in OSS messages but no suggest found...

Statement: in PO I enter a condition for example FRC2, then I enter in condition 'detail' and I change the vendor defaulted from PO header with another one,,,,

Question: can I default from standard (I mean with a user transaction such as MEK1 which has not impact, I have already tried) a different vendor rather than PO header one in detail condition without every time entering it manually?..Or I am forced to use a exit/badi?

Thanks for your attention

BR

Massimiliano