>>>Here is a fragment of my code:
>>>
>>>with someobject
>>>*!* Populate Item data
>>>SELECT curItemData
>>>.txtCustomer.Value = curItemData.customer
>>>.txtSku.Value = curItemData.sku
>>>.txQCName.Value = curItemData.fullname
>>>.pcBarcode = curItemData.barcode
>>>WITH .cboDefects
>>> IF EMPTY(.ControlSource)
>>> TRY
>>> .ControlSource = 'curItemData.defect_id'
>>> CATCH TO oErr
>>> FINALLY
>>> ENDTRY
>>> *.ControlSource = 'curItemData.defect_id'
>>> ENDIF
>>> .Requery()
>>>ENDWITH
>>>endwith
>>>And here is an error I am getting:
>>>Alias 'CURITEMDATA' is not found. frmseconds.cbodefects.ControlSource 0
>>>If it's not found then how come it did not fail in any line above the erroring line?
>>>
>>>Thanks for help.
>>
>>Did you close the cursor somewhere after this code?
>
>No, but I am switching data sessions though. Strange thing is that sometimes it fails, sometime not.

If you switch data sessions for 'prolonged' time then you provoke this error. You may switch data session and return back in the 'next' line, no more. Make sure that you don't call setfocus, activate and any other interface-related methods/events between datasession switch lines.