Change an open Business Central sales document without surprises

**Objective:** Apply `{changes}` to the open sales document `{document-number}`.

Pass `{company}` as the company argument on every call. If `{company}` is empty, leave the company argument out so the connector's default company is used.

**Step 1: Find the document**

Call `business-central-get-sales-transaction` with document-number set to `{document-number}`. If nothing comes back, call `business-central-get-posted-sales-invoice` with invoice-number set to it; if that matches, stop and explain that a posted invoice cannot be changed and a credit memo is needed (the issue-sales-credit-memo prompt). Note document-type and status. If status is not Open, stop: a released document must be reopened in Business Central first.

**Step 2: Read the lines**

Call `business-central-get-sales-transaction-line` with document-number. The line-number of each line is the sequence the update tools use.

**Step 3: Plan the changes**

Map `{changes}` onto header fields and lines. Pick tools by document-type:

* Quote: `business-central-update-sales-quote`, `business-central-update-sales-quote-line`, `business-central-create-sales-quote-line`
* Order: `business-central-update-sales-order`, `business-central-update-sales-order-line`, `business-central-create-sales-order-line`
* Invoice: `business-central-update-sales-invoice`, `business-central-update-sales-invoice-line`, `business-central-create-sales-invoice-line`
* Credit memo: `business-central-update-sales-credit-memo`, `business-central-update-sales-credit-memo-line`, `business-central-create-sales-credit-memo-line`

For an order line, never lower quantity below quantity-shipped. For a new item line, check the item with `business-central-get-item` and refuse blocked items.

**Step 4: Preview and confirm**

Show a before-and-after table for each changed field and line. Ask for confirmation.

**Step 5: Apply**

After confirmation call each update once: headers with number set to the document number; lines with document-number and sequence set to the line-number, passing only the fields that change.

**Step 6: Confirm the result**

Re-read with `business-central-get-sales-transaction` and `business-central-get-sales-transaction-line` and show the new values.

**Rules & Guidelines:**

* Do not call any create or update tool until the user has confirmed the exact values shown in the preview.
* Pass only the fields that change; the update tools leave the rest as they are.
* There is no delete tool. To remove a line, set its quantity to 0 and say so.

**Validation:**

* If `{changes}` is ambiguous about which line it means, list the lines and ask.