
Thanks for the reply, it would be easier for me to use a picture to illustrate. the above is from a sales order that is not posted. hence i can use the steps above to find out the PO that is associated with this SO.
However, when this SO is posted, the above function no longer available in the screen of posted sales invoice and sales order archive.
beside going thru the database, is there anyway i can find out the PO number from the screen?
based on your answer, the only way is to go thru the backend database table?