MR11 and PO Qnty issue.

Hi Experts,

Have an issue in MR11 Inconsistent.

The details are as follows,

1. 1. PO1-item 10 quantity 1 EA

PO2 item 10 quantity 1 EA and

PO2 item 20 quantity 1 EA

1. 2. GR done for1 EA - with  -

PO1-item10 quantity 1 EA

PO2 item 10 quantity 2 EA and

PO2 item 20 quantity 2 EA

1. 3. IR done for as following

PO1 item10 quantity 2 EA

PO2 item 10 quantity 4 EA and

PO2 item 20 quantity 4 EA

1. 4. PO History

GR Items-PO- 1 item10 quantity 1 EA and IR item 10 quantity 2

GR Items-PO- 1 item10 quantity 2 EA and IR item 10 quantity 4

GR Items-PO- 1 item20 quantity 2 EA and IR item 20 quantity 4

How to update quantity value in PO and GR?

When trying to do MR11 reversal and system gave error message as shown below,

Purchase order 2 item 10 history already inconsistent --> Quantity  

Purchase order item 20 history already inconsistent --> Quantity 

There is program set up for PO – that PO cannot be changed once GR done.

Kindly advise me on how to fix this issue.

Thanks in advance for your help

Sanjay