TUFLOW Message 1513
TUFLOW Message 
ERROR 1513 - Input variable in line below has not previously been defined.  Operating Control Line = If 'a' == 'b'; Operating Control Input Variable = 'a'
Alternate Message 
NA
Message Type 
ERROR
Description 
User defined variables used in the IF logic has not previously been defined.
Suggestions 
Define operating variable. Scenarios aren't currently supported in the .toc file, different .toc file can be read in as a scenario in .ecf or variables can be defined outside of the .toc file with the Set Variable  command and used in a single toc file.
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