--函数中不能调用动态SQL，使用用存储过程吧。如果还要对函数做其他操作，换成存储过程不方便，可以考虑把其他操作一起封装在存储过程里面。如：
create proc [dbo].[FUN_YSCL_GetSpvalue]
@FormID VARCHAR(200)
AS
BEGIN
DECLARE @TableID VARCHAR(20)
SELECT @TableID = tb.vcTableID FROM tG10Money tm LEFT JOIN tG10Tables tb ON tm.iFormType = tb.ID WHERE vcFormID = @FormID
DECLARE @strSQL NVARCHAR(2000)
SET @strSQL = ‘‘
SET @strSQL += ‘ SELECT ‘
SET @strSQL += ‘@spvalue=tb.SPValue‘
SET @strSQL += ‘ FROM ‘ + @TableID + ‘ tb‘
SET @strSQL += ‘ RIGHT JOIN ( SELECT DISTINCT‘
SET @strSQL += ‘ FormID ,‘
SET @strSQL += ‘ MAX(WFNodeIndex) AS maxnode‘
SET @strSQL += ‘ FROM tFS1001‘
SET @strSQL += ‘ WHERE RowType = 1‘
SET @strSQL += ‘ GROUP BY WFID ,‘
SET @strSQL += ‘ FormID‘
SET @strSQL += ‘ ) maxnode‘
SET @strSQL += ‘ ON tb.FormID = maxnode.FormID‘
SET @strSQL += ‘ AND tb.WFNodeIndex = maxnode.maxnode‘
SET @strSQL += ‘ WHERE tb.FormID= ‘‘‘+@FormID+‘‘‘‘
DECLARE @spvalue VARCHAR(20)
EXEC sp_executesql @strSQL,N‘@spvalue VARCHAR(20) out‘,@spvalue OUTPUT
select FormID,@spvalue FROM tFormMoney
END自定义函数执行动态sql语句
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