Hi Tanya
Thank you for the comprehensive answer. I am struggling to get at the archive line data. I have created the link as you detail above, but it only draws back the header archive data.
Looking at the info box, I can see that I need table 5110, from sub-form 5168 which feeds off of 5167.

However, when I try to create an OData link for 5167 (Header) or 5168 (Line) and link to it in Power BI, I get an error message (image edited to remove confidential data). BC shows their page references as Purchase Order Archive (5167, Document) and Purchase Order Archive Subform (5168, ListPart) :


I have created the link in exactly the same way as I have for other pages and they work fine, so I don't think I've done something wrong. Is it because they are subform and document rather than straightforward pages and, if so, how can I get the table exposed to Power BI instead, please?
Thank in advance.
Regards
Simon