Suspend Dunning lock and dunning procedures

Event 0303 has this description: The function module called up at Event 0303 provides the option of executing further checks for an open item, which may mean suspending dunning or changing the dunning procedure.

Tried to use it but it did not work. I saw the program lSAP is checking first if a contract account has a dunning lock. If there is, it generates an the message and no longer executes the remaining part of the FORM..ENDFORM and therefore doesn't call event 0303.

If a contract account has an active dunning lock reason, is there a way to trigger dunning or suspend it?