Communication with NAVision with SOAP API from SQL - sql-server

Question

I have a problem with GET method from API. So, I had some code for body for GET method, and when I copy this code to postman works fine.
set #requestBody = '<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<ReadMultiple xmlns="urn:microsoft-dynamics-schemas/page/rfidtransferlines">
<filter>
<Field>Document_No</Field>
<Criteria>PN21-001126</Criteria>
</filter>
</ReadMultiple>
</s:Body>
</s:Envelope>'
print #requestBody
Now, I want to get data from API, and I have code for GET method:
-- Open the connection.
EXEC sp_OACreate 'MSXML2.ServerXMLHTTP', #token OUT; --MSXML2.ServerXMLHTTP
IF #ret <> 0 RAISERROR('Unable to open HTTP connection.', 10, 1);
-- Send the request.
EXEC sp_OAMethod #token, 'open', NULL, 'GET', #url, 'false',#username,#password;
EXEC sp_OAMethod #token, 'setRequestHeader', NULL, 'Connection', 'keep-alive';
EXEC sp_OAMethod #token, 'setRequestHeader', NULL, 'SOAPAction', 'ReadMultiple';
EXEC sp_OAMethod #token, 'setRequestHeader', NULL, 'Content-type', #contentType;
EXEC sp_OAMethod #token, 'send',NULL,#requestBody;
-- Handle the response.
EXEC sp_OAGetProperty #token, 'status', #statusCode OUT;
EXEC sp_OAGetProperty #token, 'statusText', #statusText OUT;
EXEC sp_OAGetProperty #token, 'responseText', #responseText OUT;
-- Show the response.
PRINT 'Status: ' + #statusCode + ' (' + #statusText + ')';
PRINT 'Response text: ' + #responseText;
I think that problem is here :
EXEC sp_OAMethod #token, 'send',NULL,#requestBody;
or maybe my variable:
DECLARE #responseText NVARCHAR(4000);
is set to 4000 characters, because is max for SQL Server.
Can somebody help me.