Is it possible to unload a program at runtime?

Hi experts,
maybe you can help solve the following problem:
I have a customer program that is calling a sap standard function module several times. The function module is BAPI_BUPA_ADDRESS_ADD. The BAPI works fine when calling it once but I get errors when repeating the call.
I assume that the error is caused by the fact, that the data of the respective function group is no longer initial after the first call. Of course this would be a programming error. My assumption is approved by a workaround: When I call the function module in a separate work process with "starting new task" I observe no errors.
Now I wonder if there is a better workaround because starting a new task for each call has the disadvantage of making each call asynchronous - moreover we create many work processes. For example is there a way to unload or refresh a function group at runtime so that the second call is like the first?
Thanks
Peter

Hi Thomas,
after importing the patch of sap note 1256410 the error "update was terminated", caused by function module BUPA_ADR_WRITE_DOCUMENT due to duplicate entries in table CDPOS, did not appear anymore.
However calling the function module BAPI_BUPA_ADDRESS_ADD several times destroys the address data of the business partner because the BAPI does not refresh the local address memory. I found out that this can be done with function module BUP_MEMORY_ADDRESS_INIT.
Thus actually two problems were involved here.
Peter

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