SAML XML modification

I'm setting up a SAML SP. The IDP is external and already in place, working for a bunch of other of their customers. I'm pretty new at this so I have a few questions.

 

What I've done so far is setup the SP locally, import the IDP xml, bind the SP to external IDP. I have an Access Policy made with a simple SAML agent, nothing complex there. All that seems pretty straight forward. Then I exported the SP XML and uploaded it onto a SAML portal the IDP organisation provides. It then valides my SP XML and gives a number of errors and warnings back. NONE of these errors can be fixed via the GUI as far as I can see. There are blocks of XML missing and other values the IDP wants that are not selectable in the GUI. So here are my questions:

 

1. Is the solution to export the SP XML and manually edit the XML file before uploading it to the IDP?
2. Do I need to import the modified XML to my local SP as well? Will the BIGIP understand and comply with the modifications made?

I'm running version 13.1.