Does anyone know if receipt and issue margins are also applied to production orders?

 I have a finished good with three more intermediate BOM items and checking the explanations from the explosion form, it looks like it’s accumulating all the margins along the products.
By the way, the margins are set only at master plan level.

e.g. 2d receipt + 4d issue margin

level 1 - 4d delayed due to safety margins (I suppose issue);

level 2 - 6d delayed (I suppose rec + issue);

level 3 - 6d delayed

level 4 - 4d delayed (at the end my FG is being delayed 20d)

Any thougths?