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What does Unity or Control Expert Build error E1203 usage of multi assignment statements is disabled indicate?

Published date: 19 April 2019

Project is using some Altivar 930 VFD DTMs/DFBs. When built it returns the E1203 error.

Product line
Control Expert, Unity Pro, Altivar

This indicates that the "Allow multi assignment [a:=b:=c] (ST/LD)" option in Tools -> Project Settings -> Program -> Languages -> Common must be set.

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