EC1189

Ordinary rules may override the commands of other ordinary rules, though there is a warning. For #pragma multi, command overriding is prohibited.

Overriding of the commands for a single target is tricky enough, but where multiple targets are to be updated simultaneously, the practice of overriding commands is even more confusing, and so it is prohibited.

This error triggers when two #pragma multi rules with the same target set both specify commands.

Pick the commands you want, and drop the other ones.