Licence reconciliations move every month. Distributor invoices tie back to client projects. Carrier bills never match the quote. A coding error in any of them leaks into client billing.
Illustrative example.
Distributor and vendor-direct invoices: line-item heavy, and tied to client projects that need recharging.
Licence reconciliations that move every month, per-seat counts and security tooling. High volume, small variances, easy to mis-post.
Carrier bills with usage components that never match the quote, coded to the right client and the right cost line.
When a carrier bill lands on the wrong client, or a hardware line never reaches the project it was bought for, the cost is yours and the recharge never happens. Mandate codes every supplier line to the client and cost line your history says it belongs to, and records why, so the recharge can be checked.
Mandate reads your supplier records and chart of accounts directly. When you instruct it in writing, it creates draft purchase invoices behind your own approval gates. Your Business Central partner grants the access; nothing else changes.