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