An heir or beneficiary to an estate may waive a final accounting, which is the detailed description of the financial transaction of the estate: the date-of-death inventory plus income minus expenses equals what is available for distribution. Heirs and beneficiaries often agree to waive (excuse the preparation and filing of) the accounting because they believe they have enough information to know what they are entitled to and wish to avoid the expense of preparing the accounting.
Best wishes for a favorable outcome, and please remember to designate a best answer.
There is really not enough information to fully answer your question. My guess is that the waiver is actually seeking the approval and consent to the account that has been provided and not waiver of there BEING an accounting.
When the final account needs to be approved by the court, if all interested parties waive and consent to the account, then you can avoid having a hearing in most cases. This saves time and money and allows the estate to be distributed more quickly.
Obviously, you would only do this when the account is in order and there are no objections.
James Frederick