MIRO and alternative reconciliation accounts?

Hi all,

The situation is following. Purchase order is made and when in MIRO we are processing this PO into a subsequent credit then it is not possible to change an reconciliation account for that vendor even if I did set it up in SPRO as an alternative rec. acc. and have set it to be ready for posting.

One solution would be to define a different doc. type and then do a substitution (I guess) but I wonder why this doesn't work the same way as posting a vendor invoice from FI?!

Thanks

D.