input help: missing specification type

Hello,

In SAP_EHS, in the input help (F4) of the fiels specification type (TCG31_INTRFLG), I am not able to see all specifcation types of the table TCG31.

Do you know how to add, for exmple, specification type DG_CL_SUB in the input help for the field specification type of the Tcode CG02?

Thank's

Ludovic