employee synchronization with existing business partner (/SHCM/RH_SYNC_BUPA_EMPL_SINGLE)

Hello Experts!

we usage HR module successful s/4hana itself (no occurrence origin oregon ECC oregon immoderate third-party system) so  each of unit is already maintained successful PA30. (including 105 info benignant for idiosyncratic ID)
on the different hand, those unit are already defined arsenic BP with wide and supplier roles.
so we did not person immoderate acquisition with caller exemplary of worker and concern users.
everything works fine, but present , there's request for "business user" successful immoderate workflows successful Fiori. what things should beryllium done?
even we activate /SHCM/EE_BP_1 concern function. was that necessary? 
the configuration for T77S0 is done. erstwhile usage "/SHCM/RH_SYNC_BUPA_EMPL_SINGLE" to make a caller BP it works well.

but erstwhile we usage that programme to conscionable marque narration betwixt existing BP and worker with aforesaid code, the mistake rise that it is duplicated:

Business spouse 467211 already exists - Synchronization failed.

in SLG1.

so the worker is there, with the aforesaid fig BP already beryllium (with wide and vendor role) , we conscionable request to synchronize them to payment from the conception of concern user.

thanks.