Explaination UML activity diagram Fulfilment process

["Alberto Daniotti" <albertodaniotti@libero.it>]

Hi!

            I watched UBL 2.1 specification and I am  blocked about the meaning of dashed arrows in the activity diagram of fulfilment with Despatch Advice Process. My knowledge about UML 1.5 is not good and I don't understand especially the meaning of incoming dashed arrow.

I hope that you can explain me this thing.

Thank you

Alberto