.-USING0WARN=YES-.   
>>-+----------------+------------------------------------------><
   '-USING0WARN=NO--'   

YES

the assembler issues warning diagnostic message ASMA306W when a USING:

• Is coincident with the implied USING 0,0 and option USING(WARN(1)) is in effect.
• Overlaps the implied USING 0,0 and option USING(WARN(4)) is in effect.

NO

the assembler suppresses warning diagnostic message ASMA306W.

Default

USING0WARN=YES