Hi Susan,
Generally speaking, in order for Adagio to display a field in a grid, that field information must be stored in the respective database record. Purchase Orders does not store the vendor name in the document header, footer or total, which is why it cannot be added to the grid via the column editor.
We have made a few exceptions over the years - such as the Customer name to AR invoice batches - so it is technically possible to make changes such as these. Though I understand there may be a performance hit for large databases (each PO would have to read the AP vendors file to display the name).
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Regards,
Softrak Tech Support