BPMN11 — Contradiction about process data input and output allowed connection with data association

Page 213 states the following restriction about process data input and incoming data association:

• Data Inputs MAY have incoming Data Associations:
  • If the Data Input is directly contained by the top-level Process, it MUST not be the target of Data Associations within the underlying model. Only Data Inputs that are contained by Activities or Events MAY be the target of Data Associations in the model.

Page 215 states the following restriction about process data output and outgoing data association:

• Data Outputs MAY have outgoing DataAssociations.
  • If the Data Output is directly contained by the top-level Process, it MUST not be the source of Data Associations within the underlying model. Only Data Outputs that are contained by Activities or Events MAY be the target of Data Associations in the model.

So according to those, a Process Data Input MUST NOT have incoming data association and a process Data Output MUST NOT have outgoing data association.

But on page 225, the following is stated:

In the case of a Start Event, the Data Inputs of the enclosing process are available as targets to the DataOutputAssociations of the Event. This way the Process Data Inputs can be filled using the elements that triggered the Start Event.

In the case of an End Event, the Data Outputs of the enclosing process are available as sources to the DataInputAssociations of the Event. This way the resulting elements of the End Event can use the Process Data Outputs as sources.

So according to those paragraphs, a process data input might have incoming data association if the source is a start event and a process data output might have outgoing data association if the target is an end event.

Those exceptions should be written on page 213 and 215 to avoid confusion.