How to deal with Rfc Exception in SOAP TO RFC scenrio?

I have created a simple scenrio "SOAP TO RFC"  to reverse delivery orders.

Generally,it works fine.

But one day ,when i reverse a delivery order which it is  in editing.

The Pi server return "Server Error" as it can not find a proper mapping for RFC exceptions.

So .i try to do this in SE37 .The RFC application throws exception message as follows:

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Please help me to deal with this exception message to prevending from server error.

Thanks!