UI+DI: Updating hidden User defined fields in Matrix

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I put some user defined fields to the matrix in the Quotation form (uid 139).

To fill the user defined fields (cell-level) with data they have to be activated. Everything works fine.

Now I want to hide the fields an fill them with data.

I tried these lines of code:

oSBOMatrix = oForm.Items.Item(.....).Specific

l_uds = oForm.DataSources.UserDataSources.Add("U_ek_1_fw", BoDataType.dt_PRICE)

l_oColumns = oSBOMatrix.Columns

l_oColumn = l_oColumns.Item("U_ek_1_fw")

l_oColumn.DataBind.SetBound(True, "", "U_ek_1_fw")

l_uds.Value = 100

oSBOMatrix.SetLineData(1)

With the DataBind statement I get this error:

The item is not a user defined item and cannot be manipulated in such manner

Can I use UserDataSources with existing forms?

How can I fill hidden fields within a matrix in an existing form?

thx,

Ingo