Turn Teamwork.com billable time into a Business Central draft invoice

**Objective:** Turn the billable Teamwork time logged for client `{customer-name}` since `{from-date}` into a draft (unposted) sales invoice in Business Central company `{company}` (default: the default company), billing each project on its own line against resource or G/L account `{billing-number}`.

**Step 1: Collect the billable time**

Call `teamwork-get-companies` (Teamwork server) with `name.contains` set to `{customer-name}`. If more than one company matches, list them and ask which one is meant. Call `teamwork-get-projects` with its `company-id`. Then, for each project, call `teamwork-get-time` with `project-id`, `is-billable` set to true and `time-logged.from` set to `{from-date}` as YYYY-MM-DD. Sum `minutes` and `billable-total` per project. Leave out projects with no billable time. If nothing is billable, stop and say so.

**Step 2: Check it has not been billed already**

Call `business-central-get-customer` (Business Central server) with `name.contains` set to `{customer-name}`, and `company` set to `{company}` when given. Choose the customer whose name matches the Teamwork company. If none matches, stop and say so. Do not create a customer. If the customer is blocked, stop and say so.

Call `business-central-get-posted-sales-invoice` with `sell-to-customer-number` set to the customer-number and `posting-date.from` set to `{from-date}`, and call `business-central-get-sales-transaction` with `sell-to-customer-number` set to it and `document-type` set to Invoice. If any invoice in either result mentions one of the projects, show it and ask whether to continue.

**Step 3: Confirm the draft**

Show the invoice that would be created. The header uses the customer-number as both `customer-number` and `bill-to-customer-number`, and the external-document-number is "Teamwork time from `{from-date}`". Show one line per project: description "<project-name>: <hours> hours", quantity as hours (minutes divided by 60, two decimals), unit-price as billable-total divided by hours, and number-on-line `{billing-number}`. Show the total. Ask the user to confirm. If they do not clearly say yes, stop without creating anything.

**Step 4: Create and verify**

After the user confirms:

1. Call `business-central-create-sales-invoice` with `customer-number`, `bill-to-customer-number`, `external-document-number`, and `company` when given. Keep the returned `number`.
2. For each project, call `business-central-create-sales-invoice-line` with `document-number` set to that number, `line-type` set to Resource (or Account when `{billing-number}` is a G/L account), `number-on-line` set to `{billing-number}`, and `description`, `quantity` and `unit-price` as confirmed.
3. Call `business-central-get-sales-transaction` with `document-number` set to the new number and report the stored total against the confirmed total.

**Rules & Guidelines:**

* `teamwork-get-companies`, `teamwork-get-projects` and `teamwork-get-time` are on the Teamwork server. `business-central-get-customer`, `business-central-get-posted-sales-invoice`, `business-central-get-sales-transaction`, `business-central-create-sales-invoice` and `business-central-create-sales-invoice-line` are on the Business Central server.
* Only `business-central-create-sales-invoice` (once) and `business-central-create-sales-invoice-line` (once per confirmed line) may write, and only after the user confirms in Step 3. Do NOT call `business-central-update-sales-invoice`, `business-central-create-customer`, `teamwork-update-time-entry` or any other write tool.
* The invoice stays a draft. Nothing in this prompt posts it.

**Validation:**

* If a line is rejected, for example because the line-type does not suit `{billing-number}`, stop creating lines, report the error and the invoice number created so far, and let the user fix it in Business Central. Do not guess other line types.
* Teamwork billable totals are in the site currency. If the customer is billed in a different currency, say so before Step 3 and ask how to proceed.