Parent content type is not found correctly

I made a new content type for my feature with the following definition:

<ContentType ID="0x01C428C71042B34562B51A69FEBFF26F91"
Name="Urlaubsanspruch"
Hidden="TRUE"
Group="Urlaubsantrag">
<FieldRefs>
<FieldRef ID="{3944F8B9-21F8-42c8-85AB-BEEF4E863688}" Name="Mitarbeiter"/>
<FieldRef ID="{8ADC8169-6BA9-4d7e-B77D-B0F8B79BBEC5}" Name="Vertreter"/>
<FieldRef ID="{FE07F11B-C5CE-4067-8F54-55440D516558}" Name="Vorgesetzter"/>
<FieldRef ID="{213DCBD5-EF1B-4175-AA2D-5258FC550A99}" Name="Personalabteilung"/>
<FieldRef ID="{6EB5AA2B-9870-4183-891C-A53BFFC51840}" Name="Anspruch"/>
<FieldRef ID="{AA6FA881-4140-4604-BC17-7FE750DE0BED}" Name="AnspruchVorjahr"/>
<FieldRef ID="{240C5537-78F8-4b7b-ABF1-63EA3CA85F8B}" Name="Gesamtanspruch"/>
<RemoveFieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" Name="Title"/>
</FieldRefs>
</ContentType>

Problem is, when I activate the feature, it seems to be stuck in a loop, filling my log files with the following message:

Failed to find the parent content type ID="ct-1031-0x01c428c71042b34562b51a69febff26f" for content type ID="ct-1031-0x01c428c71042b34562b51a69febff26f91".

Why does it try to find the parent by the Content Type I defined I though the ID defines the parents, in this case 0x01
Also adding the attribute BaseType="0x01" didn't change this message.

I looked at the ctypeswss.xml, where all the internal content types are defined, and they did it the same way. Why doesn't it work for me

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Parent content type is not found correctly

K Sumeet
After looking closely again at the MSDN-Article about adding content types I found out, that you have to add 00 between the parent and the rest of the ID, when you are using a guid as content type id...
Parent content type is not found correctly

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