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You must acknowledge all addenda for an invitation in order to submit the related proposal. If an addendum is issued by your bid coordinator after you have submitted your proposal, your proposal will be reset to 'Pending' so that you have the opportunity to update the proposal with the new information requested in the addenda. Once you have finished updating your proposal according to the latest addenda, you can submit it again.
To acknowledge an invitation addendum
Now you can go to your proposal and update it according to the changes described in the Synopsis section.