Unable to locate Global Property

The following error message comes up:

“Set Global Property (FleetA1): Unable to locate Global Property named speed in Named Zone Fleet1”

but it the Global Property is there, at least so it looks:

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What is wrong?

Going to need more information. What process is trying to use the Global Property and where is this process located?

A moving piece on one map is changing the layers of another piece (following Property Value) on a different map in a zone named Fleet1. I can easily have the layer change done everywhere. Even everwhere, but in zone Fleet1, but not only in zone Fleet1.

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