Hello ,
have you maintained any tolerance Limit ?
| PO | Gr | IR | |
| 1(10) | 1 | 1 | 2 |
| 2(10) | 1 | 2 | 4 |
| 2(20) | 1 | 2 | 4 |
1 Do one thing if stock is there , Do credit memo for IR , cancellation of GRN and delete the Po and Create a new Po .
( or )
please go through this link SAP Threeway Match Functionality & configuration
migo quantity may be less or more and miro should be for the actual purchase order qty in sap
Here if you consider as free item in PO , there will not be any problem for the GR/IR account