You can easily update the header data of multiple invoices (batch) by following the steps below:

1. Navigate to the AP module and search for the required invoices, or apply filters by status/substatus as needed.

2. Select the invoices, holding down the Ctrl key to choose multiple invoices.

3. From the dropdown menu, choose Update header data. 

4. A new window will open displaying all header data fields. Select the field(s) you want to update and click Continue. 

5. In the Find field, enter the data you want to replace. In the Replace with field, enter the updated data. Once done, click Update. 

6. The batch process will start, and the data will be updated. You can verify whether the changes were successful by selecting the View Results option.

7. The successful changes made to fields like Invoice Date can be viewed in the Results tab.