show the bill document number in Purchase Order Register

AI generated answer (using internal Slack threads):

To show the bill document number in the Purchase Order Register, you can use the

orderdoc

field on the item sublist of the vendor bill record. This field contains the internal id of the purchase order. If you are looking for the external document number from the actual bill from your vendor, you can use the Reference Number field in the Vendor Bills/Bill Credits. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******