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dfChkDidExp()
Check a DID expression
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Syntax:

     dfChkDidExp( <nIndex>, <bRelKey>,
                  <bFilter>, <bBreak> ) --> lRet

Parameters:

     <nIndex>   Relation index
     <bRelKey>  Relation KEY
     <bFilter>  Relation Filter
     <bBreak>   Relation Break

Returns:

     <lRet>     If .T. the relation is verified

Description:

     Check a relation KEY in the dbrid.prg

Example:

     // See an example of dfChkDidExp() in dbrid.prg

See also:

     dfUse()