1968197 - Indexing failed for Object Type: HRTMC_REL_P_Q_032

When indexing connector HRTMC_REL_P_Q_032 you get an error:

Job started
Step 001 started (program ESH_IX_CRT_INDEX_OBJECT_TYPE, variant
XXXXXXXXXXXXXX, user ID USER)
Start Indexing For:
Object Type: HRTMC_REL_P_Q_032
Execute initial indexing
Search object connector SYSTCLNT~HRTMC_REL_P_Q_032~: New status: Indexing
Error Messages (5)
Populating index data unsuccessful for object type HRTMC_REL_P_Q_032 in index INDEX_ID
An exception was raised
Serializing data to XML stream unsuccessful for index
ESH:SYSCLNT~SYSCLNT~HRTMC_REL_P_Q_032~HRPAD31
TREX call terminated with technical error
Error in serialization
Information Messages (2)
Indexing of application data was unsuccessful
Search object connector SYSCLNT~HRTMC_REL_P_Q_032~: New status: Error
While Indexing
Indexing ended with error
Job cancelled after system exception ERROR_MESSAGE

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