SP code not working, maybe wrong parameter

I have code that takes a nvarchar(max) value to run a SP.
If I run the SP directly on SSMS it works fine, the SP does the job. But using ASP Classic code to pass the parameter which is a very long XML string to the SP is giving errors saying the data is getting truncated. Here is the code we currently have:

set sp_usp_xmlparse = Server.CreateObject("ADODB.Command")
    sp_usp_xmlparse.ActiveConnection = MM_bluedot_STRING
    sp_usp_xmlparse.CommandText = "dbo.usp_XMLParse"
    sp_usp_xmlparse.CommandType = 4
    sp_usp_xmlparse.CommandTimeout = 0
    sp_usp_xmlparse.Prepared = true
    sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@RETURN_VALUE", 3, 4)
    sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@blob", 200, 1, -1, qnrBlobXML)
    sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@UserID", 3, 1, -1, UpdateStatus__MMColParam)
    sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@FirmID", 3, 1, -1, UpdateStatus__MMColParam2)

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Any ideas what could be wrong?
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Pawan KumarDatabase ExpertCommented:
can you show you SP.. ?

You need to check for the Datatypes and the length we are using? One/more length may be smaller than what data we are inserting.
AleksAuthor Commented:
The data type for @blob is nvarchar(max) in the DB, if I run the SP locally it works fine, so its not the size of the string but the ASP code above.
Pawan KumarDatabase ExpertCommented:
Are you using dynamic string in your SP?

What the length of that dynamic string....change that to MAX.
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AleksAuthor Commented:
This is how the variables are declared in the SP. It is already MAX.

	@blob varchar(max),
	@UserID int,
	@FirmID int

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Pawan KumarDatabase ExpertCommented:
Can you show you SP ?

There must be a dynamic string there..?

Also What is this 200?

sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@blob", 200, 1, -1, qnrBlobXML)
Big MontyWeb Ninja at largeCommented:
you're telling your SP to only allow the @blob parameter to accept 200 characters, even though it's a nvarchar(max). Change it to use the length of your qnrBlobXML variable and you should be ok:

sp_usp_xmlparse.Parameters.Append sp_usp_xmlparse.CreateParameter("@blob", Len( qnrBlobXML ), 1, -1, qnrBlobXML)

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AleksAuthor Commented:
We appreciate both inputs.
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