Error Documents Obj. -5002,Cannot insert value in the 'Folio Number' fiel

hi, i have a problem with oDocument Object in field FolioNumber.

Falló la actualización del Documento: -5002,Cannot insert value in the 'Folio Number' field.

I work with SBO 2007 PL 03.

Dim oDoc As SAPbobsCOM.Documents

oDoc = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oInvoices)

oDoc.GetByKey(oEditTextDocEntry.Value)

oDoc.FolioNumber = CType(oEditText.Value, Integer)

oDoc.Update()

Dim nErr As Integer

Dim ErrMsg As String

Call oCompany.GetLastError(nErr, ErrMsg)

If (0 <> nErr) Then

SBO_Application.MessageBox("Falló la actualización del Documento: " + Str(nErr) + "," + ErrMsg)

End If

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Extract from SDK help:

Description

Sets or returns the additional number for a printed document.

(field name: FolioNum).

Property type

Read-write property

Syntax

Visual Basic

Public Property FolioNumber() As Long

Remarks

Country-specific field for Mexico and Chile.

my country is Chile.

thanks.

Jorge

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additional information

for A/P Invoice (OPCH table) its working fine, but

A/R Invoice (OINV table) isn't working.