The second parameter for %STR is required when %STR appears on the left-hand side of an expression.
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Cause . . . . . : When built-in function %STR is specified on the left-hand side of an expression, the second parameter must be specified. The second parameter indicates the amount of modifiable storage pointed to by the first parameter. The second parameter defaults to 1.
Recovery . . . : Specify a numeric value with zero decimal positions, between 1 and 65535, as the second parameter for built-in function %STR. Compile again.
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