It is proposed that at least one occurrence of the transaction element is MANDATORY.
For this to work it is recommended that pipeline activities are only published once a financial commitment is in place. This is already standard practice for most publishers.
For publishers who report their activities to the OECD DAC Creditor Reporting System commitments are well defined.
"A commitment is a firm written obligation by a government or official agency, backed by the appropriation or availability of the necessary funds, to provide resources of a specified amount under specified financial terms and conditions and for specified purposes for the benefit of a recipient country or a multilateral agency."
For other primary source publishers the commitment should be understood as the reporting organisation's agreed total budget for the activity.