See where your purchase money goes and how concentrated it is

**Objective:** Report net purchase spend between `{start-date}` and `{end-date}` (default the current month to date), by vendor and by what was bought.

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-purchase-invoice` and `business-central-get-posted-purchase-credit-memo` with posting-date.from `{start-date}` and posting-date.to `{end-date}`. Raise max-records to 1000.

**Step 2: By vendor**

Net spend = invoice amount minus credit memo amount (excluding tax), grouped by buy-from-vendor-number.

**Step 3: By what was bought**

Call `business-central-get-posted-purchase-invoice-line` with the same dates. Group amount by type (item, G/L account, resource, fixed asset, charge) and then by number and description. Call `business-central-get-posted-purchase-credit-memo-line` and subtract.

**Step 4: Concentration**

Work out the share of spend with the top five vendors, and list vendors with only one invoice in the period.

**Step 5: Report**

* Headline: net spend, invoice count, credit total
* Top 15 vendors: vendor, invoices, net spend, share
* Spend by line type, then top 10 items and top 10 G/L accounts
* Concentration: top-five share and one-off vendors

**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.