No detail lines from the invoice are appearing in Dimensions and I cannot edit the detail lines

This is likely to be because the order number field has been populated unintentionally in Capture during verification. When this happens Capture does not transfer the details over to Dimensions because it expects to match them up with the corresponding Purchase Order. It also means that the details cannot be edited in Dimensions and will appear in the Invoice Register as For Purchase Order.
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To transfer the lines to Dimensions and allow editing, ensure the order number field is empty in Capture when it is not a Purchase Order - this will show in the Invoice Register as For Purchase Ledger.