PMRPY NIC Code - to loading and unloading contract which NIC Code is applicable?

We are working as Labour contractor in FMCG industry for Loading - unloading contract in said establishment.
In order to do registration at PMRPY portal, we are asked to select NIC Code, But we got confusion that which NIC Code to select??
Is is pertaining to Principle employer business nature? or to loading and unloading contract which NIC Code is applicable?

the code should be applicable as per the immediate employer, as principal employer may get changed for contract workers

Dear Sir
I couldn't get ur statement.
Can u please explain?

As per your statement, we should choose NIC Code as per our contract nature i.e . loading unloading. but i couldn't found NIC Code pertaining to that. so please help me find NIC Code to be selected.
Thankin You

Await for response, any one pls?

52241 Cargo handling incidental to land transport