Setting workpiece zero with G10

[MRPM]

The lathe in question is Mori Seiki SL-303 with MSG-501 controller:

We're trying to set the workpiece zero with G10 like this:

G10 L2 P1 Z-100.

This should set the Z value of G54 to -100. but it doesn't, nothing changes. But it doesn't cause an alarm either... so what's happening here?

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[tomc1967]

Are you using a presetter? I worked for Mori Seiki for 19 years and know the machines well.