BW 2.1C

OS WINT4

The RFC is working fine and you are trying to replicate data from source system (4.0B), while doing this you got an 
error an ABAP dump, in this dump the Exception Condition are "CNTL_ERROR" raised

Take a look at OSS notes 158985 and 316243. 

Depending on what patch level, GUI, or Kernel you are on. 
 

Best regards,
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