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-4324 The variable variable-name is not a character type, and cannot

be used to contain the result of concatenation.

This statement attempts to concatenate two or more character strings (using the comma as the concatenation operator) and assign the result to the named variable. Unfortunately, it is not a character variable. 4GL will not perform automatic conversion from characters in this case. Assign the concatenated string to a character variable; then, if you want to treat the result as numeric, assign the string as a whole to a numeric variable.