Problems integrating Timechimp and billit

Dear Sir/Madam,
I have been working on the integration between Timechimp and Billit for a while now.

I am encountering two problems with this integration:

1. Currently, I first create the invoices in Timechimp and then click on "Process" in Billit, instead of choosing to invoice directly in Billit from "Uninvoiced."
   The reason for this is:
   - When invoicing in Billit, I cannot indicate that I want to include an hourly specification.
   I do have that option when I create the invoices in Timechimp first.

2. When I process the draft invoices from Timechimp in Billit, the attachments (time specifications) are sent along with them. However, the extension is duplicated, e.g., urenspecificatie.pdf.pdf
   As a result, this attachment is not sent via Peppol.
   Can you check that this extension is not duplicated?