Ask an experienced agency operator about the PDA and they'll tell you the numbers matter. Ask them privately how often a line gets left off, guessed at, or entered wrong, and the answer is more often than the industry likes to say out loud.
The Problem
A proforma disbursement account is built by hand, in a spreadsheet, usually under time pressure, usually by someone also managing three other vessel calls at once. Port dues, pilotage, towage, launch services, surveyor fees, agency fee, each one a manually typed row. One missed line, one wrong rate carried over from a previous call, one formula that didn't update when a cell above it changed, and the PDA sent to the principal is wrong before it ever leaves the building.
The consequences show up later, and they're worse than the missing amount itself. Either the agency absorbs the difference and quietly eats the margin, or the agency goes back to the principal after the fact asking for more money on a call that was supposedly already approved. Neither option builds trust. Both cost more than the line item that got missed.
Why It Happens More Than Agencies Admit
Spreadsheets don't know what a port call needs. A blank spreadsheet has no memory of what last month's PDA for the same port included. Every new PDA starts from a copy of an old one, or from scratch, and whatever the person building it forgets to include simply isn't there.
The PDA and the final account live in different files. Because the PDA is a spreadsheet and the FDA is often a separate spreadsheet built weeks later by someone else, there's no built-in check that the two actually match. Discrepancies get found late, if they get found at all.
Nobody wants to be the one who says it out loud. A missed line on a PDA is an easy thing to quietly fix and move past. It rarely gets reported as a process failure, because reporting it means admitting the current process has a hole in it. So the same hole stays open for the next call, and the one after that.
The Solution
The fix isn't asking staff to be more careful. People under time pressure building the same document by hand every week will always make the same class of mistake eventually. The fix is a PDA that's built from a system that remembers what a port call actually costs, and that can't drift silently out of sync with the final account.
QUAYLINE's PDA builder works from itemised port costs specific to each call, not a blank spreadsheet. The PDA a principal approves and the FDA reconciled at the end of the call sit in the same system, checked against each other automatically instead of compared by hand weeks apart. Every approval is timestamped, so there's a clean record of exactly what was agreed and when, no reconstruction from memory required.
What To Do About It
If your agency has ever had to quietly absorb a missed line, or send an awkward follow-up email asking a principal to cover a cost that wasn't on the original PDA, that's not a one-off mistake. It's what happens when the PDA process depends entirely on one person getting a spreadsheet right under pressure, every single time.
The agencies that fix this stop losing margin to errors they never talk about, and stop having the uncomfortable conversation with a principal who's wondering why the numbers moved.