in service/src/main/java/org/apache/fineract/cn/deposit/service/internal/command/handler/InterestBearingBalanceCalculator.java [109:113]
private SubTransactionTypeEntity getSubTxnTypeEntityFromTxn(TransactionEntity transaction){
if(transaction.getSubTxnType() == null) return null;
Optional<SubTransactionTypeEntity> optsubTxn = subTransactionTypeRepository.findByIdentifier(transaction.getSubTxnType());
return (optsubTxn.isPresent() ? optsubTxn.get(): null);
}