Here we would like to draw your attention to OIAN transaction code in SAP. As we know it is being used in the SAP PM (Plant Maintenance) module. OIAN is a transaction code used for Field Selection Order Header Data in SAP.
It comes under the package INSC.
Transaction OIAN technical data table
| Tcode | OIAN |
| Purpose | Field Selection Order Header Data |
| Module | PM |
| SAP Package | INSC |
| Type | P |