Error converting query output to CDT

The entity I am querying has one level of Nesting. When I query the data using a a QUERY RULE passing id, I am getting the following error.
Expression evaluation error in rule 'QUERY_RULE' at function 'queryruleexec': Error evaluating function 'queryruleexec' : Error converting query output (rule: [QUERY_RULE], type: [CDTDT3189], objects successfully converted: [0])

Server Log file ----
Error converting query output (rule: [QUERY_RULE], type: [CDT DT3189], objects successfully converted: [0]) (APNX-1-4164-025)
Caused by: org.hibernate.HibernateException: null index column for collection: TrAMSContractAwardDT3189.contractAccTransactions at org.hibernate.persister.collection.AbstractCollectionPersister.readIndex(AbstractCollectionPersister.java:770)

But I am able to get data using SQL SELECT statement.

Can someone help me on this? Thanks.
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OriginalPostID-136737

OriginalPostID-136737