AXAPTA - Make a table field works cross-company

I learned this way from a forum . You have to just create a relation like up and care about extended data type of related fields. After that you won't need a custom lookup or supress validate method at forms. It works at AX 2009, I had no change to test with 2012.

AXAP - Cross company lookup

public void lookup(FormControl _formControl, str _filterStr)
{
      CustTable   custTable;    
      Query                   Query  = new Query();
      QueryBuildDataSource    qbds;
      SysTableLookup          SysTableLookup  =      
            SysTableLookup::newParameters(TableNum(CustTable), _formControl);
    ;
    super(_formcontrol,_filterstr);
    Query.allowCrossCompany(true);      
    Query.addCompanyRange(myTable.Company);
    qbds           = Query.addDataSource(TableNum(CustTable));
    SysTableLookup.addLookupfield(FieldNum(CustTable, AccountNum), true);      
    SysTableLookup.addLookupfield(FieldNum(CustTable, Name));
    SysTableLookup.parmQuery(Query)
    SysTableLookup.performFormLookup();
}

Don't forget to supress control's validate method!..