BPMN21 — Pages 165-167. “implementation” attribute of Send and Receive Tasks

a) Page 165

Table 10.9. Row “implementation”.

It says:
“… that will be used to send and receive the Messages.”

Table 10.9 describes Send Task element, so the Messages are sent only.

Then, it should say:
“… that will be used to send the Messages.”

“send and receive” should be replaced by “send”
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b) Page 167

Table 10.10. Row “implementation”.

It says:
“… that will be used to send and receive the Messages.”

Table 10.10 describes Receive Task element, so the Messages are received only.

Then, it should say:
“… that will be used to receive the Messages.”