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DG54_CLEAR_MESSAGES - NOTRANSL: GG: Clears the internal message table
DG54_READ_MESSAGES - NOTRANSL: GG: Get back the messages from global data declaration
DG54_SET_MSG_FLG - NOTRANSL: GG: Set message flag (messages will be accumulated)
DG54_WRITE_MESSAGE - NOTRANSL: GG: Appends the message to internal message table
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