Transforming a main part into a single (attached) part can create numbering problems. The following steps are performed to fix this problem.
Run another numbering on the entire job or by phase as it was previously performed. The result will be:
In the Document Manager, update the single part drawing for the attached piece (angle).
In the Document Manager, delete the assembly drawing (column).
The last step is to detail the assembly drawing (column).
From now on, the assembly will be back to normal with one assembly number (on the column) and a single part number for both pieces (column and angle).