Document Set custom content type - welcome page missing

Question

Sharepoint 2013. 404 error on welcome page for a following content type based on document
set:
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<Field ID="{B9B7D98D-A2D3-4191-9B30-C516C8EDD9F4}" DisplayName="Fieldpr41" Name="Fieldpr41" Type="Note" RichText="false" NumLines="3" Group="pr41" Overwrite="TRUE" />
<!-- Parent ContentType: Document Set (0x0120D520) -->
<ContentType ID="0x0120D5200062FEFD4873814585B3EFD57010F1F8AE"
Name="ContentType41"
Group="Custom Content Types"
Description="My Content Type"
Inherits="FALSE"
ProgId="SharePoint.DocumentSet"
Version="0">
<FieldRefs>
<FieldRef ID="{B9B7D98D-A2D3-4191-9B30-C516C8EDD9F4}" DisplayName="Fieldpr41" Name="Fieldpr41" />
</FieldRefs>
<XmlDocuments>
<XmlDocument
NamespaceURI=
"http://schemas.microsoft.com/office/documentsets/welcomepagefields">
<wpFields:WelcomePageFields
xmlns:wpFields=
"http://schemas.microsoft.com/office/documentsets/welcomepagefields"
LastModified="1/1/2010 08:00:00 AM">
<WelcomePageField id="83729202-DCA7-4BF8-A75B-56DDDE53189C" />
</wpFields:WelcomePageFields>
</XmlDocument>
</XmlDocuments>
</ContentType>
</Elements>
Here's
what i did after changing Inherits parameter to FALSE: 1) added ProgId parameter 2) added wpFields section 
Any ideas?

Answer 1

Hi,
According to your post, my understanding is that you got an error while creating custom document set content type.
The issue is that you set the Inherits=”FALSE” in the element. If you set the Inherits=”TRUE”, the content type would work.
Based on the article form MSDN:
If Inherits is TRUE, the child content type inherits all fields that are in the parent, including fields that users have added.
If Inherits is FALSE or absent and the parent content type is a built-in type, the child content type inherits only the fields that were in the parent content type when SharePoint Foundation was installed.
The child content type does not have any fields that users have added to the parent content type.
If Inherits is FALSE or absent and the parent content type was provisioned by a sandboxed solution, the child does not inherit any fields from the parent.
It means if you set the Inherits to true, we would lose all our customization there.
If we set Inherits="FALSE", which means you then have to remember to explicitly add into the definition all the stuff you should be inheriting, like the default Doc Set event receivers. 
More reference:
http://morefunthanapokeintheeye.blogspot.com/2012/10/how-to-successfully-provision-and.html
http://ybbest.wordpress.com/2012/07/04/how-to-deploy-document-set-using-caml-in-sharepoint2010-solution-package/
Thanks & Regards,
Jason
Jason Guo
TechNet Community Support