PO is getting locked in output message record after PO is completely released

Hi,

I have created a PO and released it at final level.

After it is released the output message is triggering automatically but it is not processed.

I have checked the further data in Message tab and found that the PO is locked.

So due to this printout is not getting generated automatically.

I have checked all the configurations and everything is configured properly.

Thanks

Nihar