'How to replace whitespaces in RML mapping?

I'm trying to use replacechars for RML mapping within a certain column of a CSV dataframe, but it doesn't work. Here is my function:

<#ReplaceChars-Function>
  fnml:functionValue [
        rr:predicateObjectMap [
            rr:predicate fno:executes ;
            rr:objectMap [ rr:constant grel:string_replaceChars ]
        ];

    rr:predicateObjectMap [
      rr:predicate grel:p_string_find ;
      rr:objectMap [ rml:constant " " ]
    ];
    rr:predicateObjectMap [
      rr:predicate grel:p_string_replace ;
      rr:objectMap [ rml:constant "-" ]
    ];

  ];
  rr:termType rr:IRI.
xmlmappingrdfowlrml-rdf


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