update query error due to linked server between 64-bit 2005 and 32-bit 2000

We got the following error messge when we try to update one record on 32-bit 2000 server through 64-bit 2005 server1 row(s) affected)
OLE DB provider "SQLNCLI" for linked server "qnxt3" returned message "Bookmark is invalid.".
Msg 7333, Level 16, State 2, Line 20
Cannot fetch a row using a bookmark from OLE DB provider "SQLNCLI" for linked server "qnxt3".
Any one know anything about this one?
Many thanks!
Jessie

Here it is, thanks!
USE [IB_Stage]
GO
DECLARE @recordsToUpdate TABLE
(
[DocRequestID] int,
[PrintedBy] varchar(20),
[PrintedDate] smalldatetime,
[PlanAction_recordid] INT
)
INSERT INTO @recordsToUpdate
SELECT [d].[DocRequestId],
[d].[PrintedBy],
[d].[PrintedDate],
[gh].[PlanAction_recordid]
FROM GICA.dbo.[fnCA_Documents](2, NULL, NULL) d
INNER JOIN [dbo].[tbl_Gaudette_Header] gh
ON [gh].[DocumentReq_ID] = [d].[DocRequestId]
WHERE gh.[PlanAction_recordid] = 3998987
UPDATE pa
SET [pa].[completeid] = [rtu].[PrintedBy],
[pa].[completedate] = [rtu].[PrintedDate]
FROM [dbo].[vwQNXTPlanAction] pa
INNER JOIN @recordsToUpdate rtu
ON [rtu].[PlanAction_recordid] = [pa].[recordid]

Sorry that I am the new one and not very clear about EXEC(...)instead of update statement. Could you specify for me? Thank you very much!
Jessie