You are unable to add the field Account Name under Sales Document in Opportunity.
Reproducing the Issue
1. Go to Sales work center;
2. Go to Opportunities view;
3. Open opportunity XXX (XXX represents the ID of the opportunity);
4. Click on Adapt -> Edit Master Layout;
5. Go to Sales Documents tab;
6. Try to add Account Name field.
The field is currently not avaialble to be used on this context.
This is the expected system behavior.
The field Account Name is planned to be included as a default hidden field under Sales Document in Opportunity on 1711 release.
KBA , SRD-CC , Cross Components , How To