Another User modified Table (ODBC -2039) - purchase order

Question

I have following scenario:
In SBO are purchase orders for one vendor where in document line is user field for storing some informations. After setting this user field to all lines (manualy) I want to recreate this purchase orders and create one purchase order for each value in user field and close lines in former orders.
For example - purchase orders lines:
docentry itemcode userfield
1            12           a
1            12           b
1            12           a
1            12           a
1            12           b
1            12           c
2            12           c
2            12           a
After recreating I want to have:
docentry itemcode userfield
3            12           a
3            12           a
3            12           a
3            12           a
4            12           b
4            12           b
5            12           c
5            12           c
Hope is clear this explanation what I want.
Im doing it so, that I create new purchase order for each value in user field - with no problem. After creating new orders Im going through old orders and Im closing the lines. And here is sometime problem with error Another user... I found out, that this problem is only when in order, where I want close line, exist already closed line and not allways.
When I try to simulate this problem, everything works. When I create order, manualy close one line in this order and wait few days and try to apply this scenario, it will falls.
This problems occurs since PL30 and in PL47 it is same.
The code I have for this is:
obj = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oPurchaseOrders)
                            obj.GetByKey(docentry)
                            obj.Comments = " xxx"
                            err_code = obj.Update()
                            If err_code <> 0 Then
                                oCompany.GetLastError(err_code, err_msg)
                                SAP.Connection.oSBOApplication.MessageBox(err_msg, 1, "OK")
                            End If
                            obj.Lines.SetCurrentLine(3)
                            obj.Lines.LineStatus = SAPbobsCOM.BoStatus.bost_Close
                            err_code = obj.Update()
                            If err_code <> 0 Then
                                oCompany.GetLastError(err_code, err_msg)
                                SAP.Connection.oSBOApplication.MessageBox(err_msg, 1, "OK")
                            End If
The double update of order is there, because when one line is closed, DI API will not allow make update of lines...
Any help is highly appreciated. Thanks

Answer 1

Partly is the problem as in the note, but I dont think that its only this problem.
When I add PO with DI with 10 lines, I can close 5 lines for example, but when next day Im trying to close the rest of lines, I get the error. When I get the error, I cannot with DI update nothing (not in lines, but I cannot update note, dates, ...).
It seems to me, when I make more updates with closing lines in short time, for example
closerow
update
closerow
update
closerow
update
after this I cannot update the order at all (it seems that this order is for DI locked).