Problem
You are unable to add invoices to a batch. When you try to select the invoices, they are not selectable and cannot be added to a batch.
Solution
Note: To add an invoice to the batch, all materials should be assigned to a technician.
Check for the following:
The invoices have an Invoice Date on them. If not, make sure the associated job is properly closed to generate an Invoice Date.
The export status of the batch to which you are adding the invoices. If the batch you are trying to add the invoices to has already been exported, you will need to create a new batch and add the invoices to the new batch.