Hello Karthik
let us differentiate your topic in two subtopics.
1.) is there a WWI document stored in DMS
2.) and can the document be used to print data
a.) I do not have personal experience with the "building block" approach. But izt seems to be that the layout is saved as "SBV" document type; as this type is the same for any WWI report: I have no clue why you can not see the document in document managemnet system (either as such or the orginal one); I assume you checked "SU53" and there is no access error?
b.) If you would like to use the layout you need to "share" data so that in the "print" preview you wil get something; which data did you enter? Accordinig to the screen; you are usinga "matnr" symbol; did you enter the data via screen? You did not indicate what you have done there; please explain
C.B.