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dbTabChk()
Tests a value in a table file
------------------------------------------------------------------------------
Syntax:

     dbTabChk( <cTabId>, @<cTabCode>|<bTabcode>,;
                <cTabMst> ) --> lRet

Parameters:

     <cTabId>   Table ID
     <cTabCode>|<bTabCode> Lookup field. cTabCode must be prefixed by @.
              If you use <bKeyVar> the var isn't passed by reference
     <cTabMst>  Control to be performed
     +----------------------------------------+
     | #define         | Description          |
     |-----------------+----------------------|
     | LT_NOTMANDATORY | Can be empty         |
     | LT_MANDATORY    | Not empty, same type |
     | LT_FREE         | Any value            |
     +----------------------------------------+

Returns:

     <lRet> is .T. if the test was true

Description:

     The value specified in <cTabCode> is tested with respect to the given
     table. The value must exist in the table.

Example:

     dbTabChk( "TabIva", @cCodIva, LT_MANDATORY )

See also:

     dbLook(), dbTabGet()