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BUG #: 56218 (SQLBUG_70)
An update to all rows in the current fetch buffer (through sp_cursor), with a cursor based on a view, may fail with the following error:
This problem is specific to the use of extended cursor procedures since ANSI T-SQL only supports an update of a single row WHERE CURRENT OF <cursor>. An ODBC application might encounter this error when updating all rows in the fetch buffer through a SQLSetPos() API call.
Process 7 unlocking unowned resource: TAB: 5:982827855 
spid7 Error: 1203, Severity: 20, State: 1
spid7 Process ID 7 attempting to unlock unowned resource TAB: 5:982827855 ..
Here are two ways to work around this behavior:
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 2 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
254561For more information, contact your primary support provider.
(http://support.microsoft.com/kb/254561/ )INF: How to Obtain Service Pack 2 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0