Get a period-over-period sales report without building it

**Objective:** Report net sales between `{start-date}` and `{end-date}` (default the current month to date), by customer, by salesperson and by item.

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: Posted invoices and credits**

Call `business-central-get-posted-sales-invoice` with posting-date.from `{start-date}` and posting-date.to `{end-date}`. Call `business-central-get-posted-sales-credit-memo` with the same dates. Raise max-records to 1000 on both and say if either hits the limit.

**Step 2: Net sales**

Net sales = invoice total-amount minus credit memo total-amount (amounts excluding tax). Group by sell-to-customer-number and by salesperson-code.

**Step 3: Items**

Call `business-central-get-posted-sales-invoice-line` and `business-central-get-posted-sales-credit-memo-line` with the same posting dates and line-type Item. Net quantity and amount by number. Where unit-cost is present on invoice lines, estimate margin as amount minus quantity times unit-cost.

**Step 4: Comparison**

Repeat Step 1 for the same length of period immediately before, and show the change.

**Step 5: Report**

* Headline: net sales, change against the prior period, number of invoices, credits as a share of sales
* Top 10 customers by net sales with change
* Sales by salesperson
* Top 10 items by amount, with quantity and estimated margin
* Customers who bought in the prior period but not this one

**Rules & Guidelines:**

* This prompt is read-only. Do not call any tool named business-central-create-* or business-central-update-*.
* Keep one table per currency if several appear.

**Validation:**

* If there are no invoices in the period, say so and stop.