Currently there is no specific entity for project qoutation headers that has a filter on type so document templates cannot be used for the header of project quotations. Expected is to use the project quotation header for custom document templates for customers. However this functionality cannot be used for this type of quotation since the filter on the sales quotation header entity is filtered on type 'Sales' (AOS).
The statement that is made by microsoft is: 
'This is not considered a bug in the current product as the entity was designed for use for Sales quotations only. '
This design does not support the functionality to make document templates for project quotations. Therefore a new entity with the right filter should be added.  
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