Warning "'Variable' is no valid assignment target" (corrected from V3.9)

?Corrected from:
PLC Designer V3.9 

Response of the new version:
If the topmost variable in a global variable list is mapped to a hardware input, no warning will appear when compiling the PLC project.
 
What happens?
When compiling the PLC project, the following warning appears in the message window of the PLC Designer:
'Variable' is no valid assignment target
 
When does this behaviour occur?
If the topmost global variable in a global variable list is mapped to a hardware input, the above warning will appear when the PLC project is compiled.
 
Which products are affected?
PLC Designer from V3.0
 
Short-term measures:
Declare a global variable at the topmost position of the global variable list which need not be mapped to a hardware input.  
 
Evaluation/recommendations:
The topmost global variable in a global variable list must not be assigned to a hardware input since this will lead to a warning during project compilation.

URL for linking this AKB article: /en-de/go/akb/201500008/1/
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