Thanks, this might be helpfull for other members. Identified that the related issue was that the "Billable Items" and "Billable Expenses" sublists associated with the customer on the invoice could be counted in the thousands. Flagging items and expenses on those sublists as "non billable" where applicable, reduced the list…

Thanks for your input!

Hi @markbell10, this has not been an issue before. The only one change that happened on our account recently is the 2025.1 upgrade about 10 days ago