Get Parent Relation between Tables using X++

static void krishh_ParentRelation(Args _args)
{
    TableId         tableId = tablenum(SalesTable);
    TableId         extTableId;
    FieldId         fieldId = fieldnum(SalesTable, CustAccount);
    DictField       dictField;
    DictType        dictType;
    DictRelation    dictRelation;
    ;
    dictField       = new DictField(tableId, fieldId);
    dictRelation    = dictField.relationObject();
    extTableId = dictRelation.externTable();
    if (extTableId)
        info(tableid2name(extTableId));
}