| This routine will save or restore records from a file being processed.
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| Syntax
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| MV.PRESERVE.DATA
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 Remarks
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| The COMMON variable called Param is used to pass data to this routine:
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| Mode, Filename, KeyPos where:
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| · | Mode -
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| · | "0" saves records in the file _CONTROL
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| · | "1" restores the relevant records from the file _CONTROL
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| · | Filename - the name of the file to save the records from
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| KeyPos - the attribute in the COMMON variable FLD that contains the keys of the records to be saved, as a multi-valued list.
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