A clause of the current DO SELECT-TYPE block refers to a type that has already been encountered.

Additional Information

The type is '%.*s'.
An ELSE clause cannot appear because the head type %.*s was handled in the CASE on line %ld of file '%.*s'.

Explanation

All case clauses of do select-type must refer to a different subtype of the static type of expression following do select-type, i.e., the head type. One of the case subtypes is repeated.

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