Tester $(FME_ENGINE) Attribute Has a Value fails on FME Server 2019.1.2

This is probably caused by the fact that $(FME_ENGINE) is not an attribute, but the value of a published parameter.

Use the AttributeCreator to create an attribute (FME_ENGINE) with the value of the parameter.

Then use the Tester on the attribute instead of the parameter.

Hope this helps.

To clearify. FME is actualy doing this:

@Value($(FME_ENGINE)) HasValue

So if $(FME_ENGINE) = FME01_Engine1 it checks if there is an attribute with the name FME01_Engine1 and if that has a value.

To me it seems like the @Evaluate(). It is a somewhat hidden step FME takes.

You could for instance do @Evaluate(1+1)-@Evaluate(1+1), which results in the string 2-2. In the AttributeCreator it shows up as 1+1)-Evaluate(1+1.

So if you test if $(Prefix) = pre_ then it is true but if $(Prefix) HasValue it is false.