Item does not match schedule line (program error)

Guys,

I am sure this would have been asked in the forum before. But, I couldn't find similar issues on search.

When I am opening a sales order Via VA02/VA03, I get following error:

Item does not match schedule line (program error)

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Details:

Item does not match schedule line (program error)

Message no. V1427

Diagnosis

Internal error.

Procedure

Repeat the transaction.

If the error occurs and you have a CRM System connected to your SAP R/3 System, the document may have been archived in the CRM System.

If the error occurs again, inform your system administrator. If the error cannot be corrected, call the SAP Hotline directly. Describe which steps preceeded the error.