Purchase Order Message Output Deletion

Hello Experts,

I have a serious dilema here and I was unable to find any related OSS notes or any other postings that related to this issue.

I have a purchase order that was created by me and it auto determined a EDI message type "ZCBU" and the status is yellow. When I enter the purchase order in ME22N I can still see the "ZCBU" message output type.

If anothrer user enters into the same PO in ME22N the "ZCBU" message output type does not display for them. It is completely gone, but still in the NAST table, not shown as deleted, and I am still able to see it in ME22N if I enter the same PO once again.

Note: If I log-off of SAP and I login again and enter the PO, then I am not able to see the "ZCBU" message output type anymore. This is veruy weird and any assistance otr ideas would be highly appreciated.

I am working in ECC 6.0

Thanks!