You can specify the TRAILING-SIGN phrase for signed numeric data items only.
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Cause . . . . . : An extended ACCEPT statement has a TRAILING-SIGN phrase in the WITH clause. If the statement refers to a group data item for which there is no MODE clause, the TRAILING-SIGN phrase applies to the signed numeric elementary data items of that group data item only. The TRAILING-SIGN phrase does not affect unsigned elementary data items.
Recovery . . . : The TRAILING-SIGN phrase affects signed numeric data items only. If the elementary data item has no sign, or if a group data item does not contain a signed numeric field, you should remove the TRAILING-SIGN phrase.