Obtain data from form

I think if you want to do it without modifications of the forms you want to use, there is no way. Problem is that you can not use recordref when calling the form. Than you will need as many record variables as count of possible source tables of the forms.

But if you can change all the forms with one function, the solution can be done - if you will have one Singleinstance codeunit with functions:

SetFieldNo
GetFieldNo
SetFieldValue
GetFieldValue

Which will set global variables in this way:

SetFieldNo - store required Field no...
GetFieldNo - read this Field no...
SetFieldValue - store the value of required Field
GetFieldValue - read the value back

You can do something as (pseudo code):

...
FormMgt.SetFieldNo(Table1.FieldNo);
FORM.RUNMODAL(Table1.FormNo);
Value := FormMgt.GetFieldValue;
...


In Form:

OnClose

FieldNo := FormMgt.GetFieldNo;
<Read Value of Field with No. FieldNo (through RecordRef and FieldRef)>
FormMgt.SetFieldValue(ValueOfTheField);

Where FormMgt is your new SingleINstance codeunit.

Think about it, it is not so hard. How to exchange data between objects is somewhere in HowTo section...