Hi Chad,
The process is a little different in Business Central, than it is in NAV.
Regarding the difference in NAV and Business Central: in NAV, when a field is missing, a developer or power user can easily go to the C/SIDE Development Environment, design the Report object, add the dataitem(s) required, recompile and save the report, and the next time you export the Custom Report Layout, you will see the fields in the urn:microsoft-dynamics-nav Custom XML Part.
In Business Central, if a field you desire is not in the report object's dataitems, the above process is not possible, since you cannot modify a base object. Also, there is (to my knowledge, to date) no ReportExtension like there is a TableExtension or a PageExtension. As a consequence, the only realistic way is to create a new custom report object. Or if you have access to a Container based Sandbox, you can open the C/SIDE Development Environment, open the base report object and save it as a new report object in the custom object range, add the desired dataitem(s), save and compile, export as text (in new format), get the deltas, use the Txt2AL script to get the AL code, use Visual Studio to compile/package the AL code as a .app and upload the app to the Production Environment. And then use Report Layout Selection > Custom Layout > Export for this new report. This will let you see the new fields in the XML mapping.
And depending on how the report is accessed, you will either need to set it as the default report a particular usage type from 'Report Selection - Sales' (or the relevant ''Report Selection - ####'), or you'll need to also create a PageExtension to add the report as an action to the ribbon of a particular page so a user can run it from there.
This thread already looks to be closed, so if you have any follow up questions on this, please create a new thread / post in the Business Central forum (and if need be, reference this thread), and I or someone else in the community can answer with a Business Central context there.
I hope this helps. If my response has answered your question, please verify by clicking Yes next to "Did this answer your question?"
