Lookup Issue

souravb wrote:

IF Type=0 THEN
   BEGIN
     GVVoucherHdr.SETRANGE(GVVoucherHdr."Voucher Type","Voucher Type");
       IF GVVoucherHdr.FIND('-') THEN
          BEGIN
            GVVoucherHdr.SETRANGE(GVVoucherHdr."Voucher No.","Voucher No.");
            IF GVVoucherHdr.FIND('-') THEN
               BEGIN
                 IF GVVoucherHdr."Account Type"=5 THEN
                    BEGIN
                      IF FORM.RUNMODAL(18,GLAcc)=ACTION::LookupOK THEN
                         BEGIN
                            "No.":=GLAcc."No.";
                            Description:=GLAcc.Name;
                         END;
                    END;
               END;
          END;
   END;

Alrighty.... a number of problems here:
1:
don't do IF Type=0... that's not very nice to read. What is much nicer to read is to specify the type explicitly

IF Type = Type::"G/L Account"

2:
Why are you nesting all of these IF statements? It looks like you're trying to find a record, so why not just set filters? There is no point in finding records more than once. Just set all the filters and THEN try to retrieve the values. By the way, if you're setting filters on a record variable, you don't have to specify the record variable again in the filter declaration. I'm not even trying to figure out what your code means, but clean it up to look something like this:

GVVoucherHdr.SETRANGE("Voucher Type","Voucher Type"); 
GVVoucherHdr.SETRANGE("Voucher No.","Voucher No."); 
GVVoucherHdr.SETRANGE("Account Type","Account Type"::"Value 5");
IF FORM.RUNMODAL(18,GLAcc)=ACTION::LookupOK THEN 
  "No.":=GLAcc."No."; 
  Description:=GLAcc.Name; 
END;

3:
What you really want to do though, is set a conditional table relation on the "No." field. Check out the Sales Line table for an example. You can specify a relationship to a different table based on the value of another field. You don't need all that code!!