Reference loads forming mass model

I'm getting the following warnings in the output file, version 22.08.00.175:

*** NOTE: NEITHER "MASS" NOR "GRAVITY" REFERENCE LOADTYPE IS PRESENT.
MASS MODEL IS FORMED BY COMBINING ALL "DEAD" AND "LIVE" (IF ANY) REFERENCE LOADTYPES.

*** NOTE: MASS MODEL FORMED WILL BE USED IN SEISMIC/RESPONSE/TIME HISTORY LOADING, IF ANY.
IF MASS MODEL IS SEPARATELY PROVIDED IN INDIVIDUAL LOADING, THE GENERATED MASS
WILL BE REPLACED BY THE MASS PROVIDED IN INDIVIDUAL LOADING.

I understood that reference loads being defined as a mass (in Y only) instead of defining loads in all three directions was only possible for seismic load cases in this version of STAAD. Can I define the reference loads as masses in Y only and will the results be valid for 3D time history/steady state analysis?