Hi,
As you have already maintained - XCP100 as source and XCD100 as target; there should not be issue.
Please check if there is entry of XCD100 as source and XCP100 as target also there. If yes try removing this entry and check.
Between just try to transport any info object or query element. Some object that is not source system dependent. This will confirm you that issue is in source system mapping only that you are maintaining by Conversion of logical source system only and nothing in moving transports from XCP100 to XCD100.
Regards,
Anil