Hallo Marine,
how do you transfer the business Partner from ECC to GTS? Do you use the program RBDMIDOC with Message type /SAPSLL/DEBMAS_SLL? If the business partner is transfer this way GTS automatically writes the transfer protocol regardless of whether the partner is created or not.
See picture
You can also use the Transaction /SAPSLL/DEBMAS_DIRR3 in ECC to see what is happing with your BPs.
Hope that helps
Regards,
Thomas