How to update AR Invoice Matrix (UDF)

Question

Hi,
I want to load the matrix data to a custom form. After user updates the custom form data. Then, get back the data to matrix.
Now I am using the following code:
- Get matrix value
For i = 1 To mMatrix.VisualRowCount
   Dim tmp as stsring = mMatrix.Columns.Item("U_UDF1").Cells.Item(i).Specific.value
   Dim tmp as stsring = mMatrix.Columns.Item("U_UDF2").Cells.Item(i).Specific.value
Next
- Update matrix value
For i As Integer = i To mDataTable.Rows.Count - 1
   mMatrix.Columns.Item("U_UDF1").Cells.Item(i + 1).Specific.value = mDataTable.GetValue("Value1",i)
   mMatrix.Columns.Item("U_UDF2").Cells.Item(i + 1).Specific.value = mDataTable.GetValue("Value2",i)
Next
Have any better solution? If the matrix's sorting order is changed, all the data will be wrong. How can solve this problem?
Regards,
On

Answer 1

The problem you are facing is because both AR Inv and AR Res Inv are stored in the same table OINV. The AR RESERVE Invoice is differentiated by the OINV field isINS which will have a Y when the Invoice is an AR Invoice. Checking this field is they approach.
1.  Add a database field (let us presume this is Field_341)
Table: AR Invoice
Field: isINS - Reserve Invoice
2. Add a Formula Field
Formula: Field_341 == "Y"
3. Add another Formula Field
Formula: Field_341 != "Y"
4. Add another Text Field:
AR Reserve Invoice
To the Text field which has INVOICE link the formula in Step 3
To the Text field which has AR Reserve Invoice link the formula in Step 2
THIS WILL WORK