Incorrect task nesting when an input parameter is shared between dependent tasks

[aplowman]

Consider: task 1 defines parameter A and produces parameter B, and task 2 requires parameter A and parameter B. If a sequence is defined on task 1, parameters A and B will be seen as distinct sequences in task 2, thus generating more task 2 elements than required.

[aplowman]

The workaround is to specify parameter A manually in task 2 as well as in task 1.