Unable to add custom SOAP header to consumer webservice in CRM( without using PI)

Hello Experts,

We have a requirement to consume webservice proxy in CRM without involving PI. We have WSDL file which has many services as depicted in the first screenshot.After checking old posts, I could add custom SOAP header by using if_wsprotocol_ws_header and there is no xml parsing error for ws_header.Have used if_ixml_stream_factory to check xml parsing error for header.

'<soapenv:Header>'

'<wsse:Security soapenv:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd">'

'<wsse:UsernameToken wsu:Id="UsernameToken-2">'

'<wsse:Username>user id</wsse:Username>'

'<wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">paswd</wsse:Password>'

'<wsse:Nonce EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary">MT0B9XFzsZJXXKmVKOsj/Q==</wsse:Nonce>'

'<wsu:Created>2015-03-30T06:29:17.407Z</wsu:Created>'

'</wsse:UsernameToken>'

'</wsse:Security>'

'</soapenv:Header>' INTO l_string.

But when my ABAP program as a whole gets executed where consumer proxy is called, then it still throws XML parsing error - undeclared namespace prefix. As mentioned, there is no parsing error for header and WSDL file as a whole in SOAP UI tool works fine,by manually adding SOAP header.

Have configured SOAMANAGER with logical port.Or any wrong setting in SOAMANAGER can cause this issue? When I tested webservice ping, it gave me attached error but I read in a SAP note that such error can be ignored.

I want to know if some more setting/coding is required if we manually add custom header to a payload? Is PI really required to implement this requirement? Payload mapping has to be done to add custom header and if that can be taken care by ABAP coding and how?