BAM Multiple steps in a unique activity

i want have unique activity in bam multiple steps. don't have orchestrations, it's ports filter.

for each step have milestones see duration (start , end).

my steps :

receive -> transfer -> check -> validate -> result

actually take interchangeid continuation part , create 4 continuation/continuationid :

-          contreceived step 1

•    continuation on  port receiveportldpflatfile
•    continuationid on port  transferldpcontent (send)

-          conttransfer step 2

•    continuation on port transferldpcontent (receive)
•    continuationid on port checkldpcontent (send)

-          contcheck step 3

•    continuation on port checkldpcontent (receive)
•    continuationid on port validateldpcontent (send)

-          contvalidate step 4

•    continuation on port validateldpcontent (receive)
•    continuationid on port ldpisokport (final send port)

i put interchangeid in activityid field on ports. correct ? because few files create 2 activities after receive step (1 completed , 1 active)

in fact system work not files.

when don't have problem, duration (start + end date) are in placed.

when have 2 lines same activity, first activity completed , other milestones put on new activity (active).

so think problem end of activity...

in screenshot can see problem

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