OPIM User Labels - Number how to add padding

In OPIM, a User Label requires to have Number as part of the Text, this required to be 3 digits long, example 003, 023, 230

The issue is if there is a leading 0's they are dropped when the ISO is produced, (3, 23, 230), I'm not sure where this is being done, but how can I force it to have leading 0's or padding for the Number field.

Example below

Name - Instrument Label

Include - EC_Class=Relief_Valve|Gauge|Flow_Meter

Exclude - EC_Class=Flow_Orifice_Plate

Text - $(DEVICE_TYPE_CODE)$$(SYSTEM)$(NUMBER)

Type- TAG

Cell Name - INSBUB

Flags - 

Thanks

Ray