Release : 12.0
Component : CA XCOM Data Transport for z/OS
Space parameters were not specified in the SYSIN01 parameters. XCOM does not support sending the zEDC attributes to the partner system.
Please note that what you are describing is zEDC compression on hardware and not XCOM's zlib zEDC compression.
XCOM takes the allocation information from the sending side. If the dataset is compressed, in this case smaller on the sending side, there is no way for XCOM to determine what the expanded size of that dataset will be on the receiving side.
It is the responsibility of the user to size that dataset properly on the receiving side or to use the appropriate SMS parameters that will cause the dataset to be compressed on the receiving side. The user would have to specify the proper XCOM parameters in the SYSIN01 for the sizing of the dataset on the receiving side.