EDR field value cannot be set in output grammar

We are facing an issue when trying to set EDR value in output grammar.

Code sample:

edrLong(DETAIL.ASS_PROTOCOL_INFO.ASS_DIAMETER_INFO.DIA_DETAIL.DIAMETER_CC.MULTIPLE_SERVICES_CREDIT_CONTROL.GRANTED_SERVICE_UNIT.CC_TIME,0,0,0,0,0,0)=120;

logPipeline("CC_TIME: "+ longToStr(edrLong(DETAIL.ASS_PROTOCOL_INFO.ASS_DIAMETER_INFO.DIA_DETAIL.DIAMETER_CC.MULTIPLE_SERVICES_CREDIT_CONTROL.GRANTED_SERVICE_UNIT.CC_TIME,0,0,0,0,0,0)));

Output in pipeline log:

CC_TIME: 0

Obviously value was not set, there are no errors in any logs. What could be the cause of such behaviour?

Thank you for any hints!