Here we would like to draw your attention to BD55OLD transaction code in SAP. As we know it is being used in the SAP BC-MID (Middleware in Basis) component which is coming under BC module (BASIS).BD55OLD is a transaction code used for Maintain IDoc Conversion in SAP.
It comes under the package SALC.
Transaction BD55OLD technical data table
| Tcode | BD55OLD |
| Purpose | Maintain IDoc Conversion |
| Module | BC |
| Component | BC-MID |
| SAP Package | SALC |
| Type | P |