In a system for securing a functional unit (4) of a building opening shading device in an associated, downwardly open receiving space (3) of a shell that can be installed on the building side, with a fastening bracket arrangement which can be preassembled in the receiving space (3) of the shell and has at least one downwardly open U- shaped mounting bracket (13) and a box (5) assigned to the functional unit (4), which can be pushed into the mounting bracket arrangement from below and can be fixed to it in the pushed-in state, is then achieved through universal usability that on the elements that can be pushed into one another in the form of the Fastening bracket arrangement and the box (5) on the one hand at least one locking bolt (17) having a horizontal locking edge (24) and on the other hand a retraction recess (18) associated therewith and having a horizontal delimiting edge facing one of the locking edge (24) on the bolt side, the locking bolt ( 17) with e In an end region it can be moved beyond the delimitation of the element receiving it facing the associated entry recess (18) and can be brought into engagement in the associated entry recess (18) of the other element.
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