Cancel Invoice wrong accounting document

Hi,,

In our company out of 8 SD (billing) invoices generated 8 accounting document and later made cancel 8 invoices. No collection is there against these invoices. But out of 8 cancel invoices 7 accounting document got generate correctly but 1 cancel invoice generate wrong accounting document and number generate differently which are not same sequential as previous numbers i.e, 6 cancel invoices accounting document is maintained serially and 7 generate wrong accounting with differenet numbers and last one generate correct which should come after 6 i.e, 11006042, 11006043, 11006044, 11006045, 11006046, 11006047, 24009010(Wrong number) and 11006048. These are all cancel invoices accounting doucument numbers. At present while I mention cancel invoice number 90000550 in VF02 and click document flow it shows error message "document 90000550 is currently being processed". And accounting document number is not being reversed also. Because cancel invoice accounting document has generatd RV document type whose sign is negative(-).

Kindly guide me urgently how I can solve this issue.

Thanks & Regards,

Samrat Roy