Call transaction VL06G

How can I perform some action in a call transaction session depending on the screen, for example, in the same session, for one set of data, an error can occur and stop my transaction. How can I pass this point ?

I am calling the transaction VL06G, make the selection, select all deliverys in the next screen, and push the button 'Post goods issue'. If an error occur, the session is over and the remaining deliverys are not processed. Please, give me a solution.