Here we would like to draw your attention to WE84 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).WE84 is a transaction code used for Assignment of IDoc and appl. fields in SAP.
It comes under the package SED.
Transaction WE84 technical data table
| Tcode | WE84 |
| Purpose | Assignment of IDoc and appl. fields |
| Module | BC |
| Component | BC-MID |
| SAP Package | SED |
| Type | P |