Error Cancel Billing Document

Hi,

I have the following problem when I delete the invoice (VF11) in relation to the position TATX (text):

- sales order without TATX position;

- delivery with additional TATX position;

- positions copied from delivery to billing (including TATX);

- when i try to cancel the billing the log shows the following messages:

    - Data inconsistency during processing of document 0090011112 (Message: VF-188 / Output type: E / Group type: F).

    - Order item 0080029201 000020 is missing (Message: VF-029 / Output type: E / Group type: F).

.

When TATX position was inserted in the sales order SAP let me delete the invoice.

Thanks.

Best regards.

Antonio