3749655 - Error "an entry already exists with the same key" when attempting to assign multiple ec instances to the same company code

• When attempting the configuration step “Assign Employee Central Instance to Company Code” in Business Integration Builder (BIB), the system prevents assigning the same company code to more than one Employee Central (EC) instance.
• Error displayed: “An entry already exists with the same key.”
• Requirement is to replicate employee data from two or more EC instances into a single company code.

SAP S/4HANA

bib, employee central, ec instance, company code, assign ec instance to company code, duplicate key, an entry already exists with the same key, one-to-one mapping, organizational objects, leading ec instance, s/4hana integration, employee replication, configuration restriction, standard limitation, key already exists , KBA , LOD-EC-INT-EE , Employee Integration EC to ERP On Premise , Problem