Data Import failed for already mapped entities

Kindly advice about this behavior in Data load rule.

"E1845" is Parent Entity with 200 level zero shared entities under it.

E1845

E1845-00

E1

..

E100

E1845-01

E101

…

E200

Filter status:

Mapping Status:

E1=A1

E2=A2

….

….

E198=A198

E199 = A199

E200 = A200

Issues :

When we run integration, it fails with validation msg that [E1845-01].[E199] and [E1845-01].[E200] are not mapped, showed in the workbench.

Not sure why it is looking for [Parent].[Child] for mappings when explicit mapping has been provided.

Note : Source is PBCS application.