Error message on EXIT_SAPMM06E_012 disable screen

Hello,

I need to issue error message on ME33K saving process,

I used EXIT_SAPMM06E_012.

When I write a message it returns to the header screen but all the screen fields are read only.

When I press Enter the EXIT is called again and process the error message again.

The only way to change the fields is to exit from the header screen and rerutn again.

Is the another way to process error message to stop saving?

Thank you very much.

Yotam.