Purpose/Overview:
When performing MARC to Instance matching, matching should occur in two tenants - central & local to realize ECS. 

Requirements/Scope:

1. Matching is limited to the central tenant and the local tenant only.

2. When a match is found in the central tenant, divert actions to the local tenant as necessary.

Approach:

• Determine if the local tenant is in a consortium.

• Determine the central tenant identifier.

• Perform matching in local tenant - if match found no need to search in central  (result - local or shadow Instance)

• Perform matching in central tenant (result - shared Instance)

Acceptance criteria:

• Matches are found in the central and local tenant.

• Only one result is produced when there is a match to the Shared Instance in the central tenant and the Shadow Instance in the local tenant