Rules and checks

Systems Central records six System Rules for Products & Services. Offer Check, List Check and Component Check check part of them. Product Check, Brand Check and Category Check also check the required identity fields before activation. A check shows one ⚠ fragment per problem it finds; blank means nothing it looks for is wrong.

Rules and their checks

System Rule	Enforced by	What the check catches	What it misses
Goods and services are one Product table	Manual review	Not applicable; Kind is derived from Product Type*	Stock, purchase cost or recipe columns added to Product
An offer sells one product through one seller	Offer Check and manual review	A blank Product*, a blank Seller*	Two products or two sellers linked to one offer
A price list has one seller and one currency	List Check	Offers from more than one seller, offers in more than one currency, a list with no offers	A single offer whose currency differs from the intended list currency when it is the only offer
A product never includes itself	Component Check	A line whose whole and part are the same single product	Partial overlaps when several products are linked; indirect loops (A includes B, B includes A)
A deal proposes exactly one offer	CRM Deal formulas and manual review	Checked in the CRM	Not checked in this base
Core and Products & Services never name their readers	Manual review	Not applicable	A column, view or link named after a reading domain

The “deal proposes exactly one offer” rule lives on the CRM Deal; see Deal. The first rule’s source document, the build rules, is still marked as a proposal awaiting approval.

Read a check

Fragment	Column	Fix
⚠ No product name. / ⚠ No product type.	Product Check	Fill Name* and select Product Type*
⚠ No brand name.	Brand Check	Fill Name*
⚠ No category name.	Category Check	Fill Name*
⚠ No product.	Offer Check	Link Product*
⚠ No price.	Offer Check	Enter Price*
⚠ No currency.	Offer Check	Select Price Currency*
⚠ No unit.	Offer Check	Select Unit*
⚠ No seller.	Offer Check	Link Seller*
⚠ Valid From is after Valid Through.	Offer Check	Correct the dates
⚠ Offers from more than one seller.	List Check	Fix Seller* on the offer that differs, or move it to another list
⚠ Offers in more than one currency.	List Check	Fix Price Currency* on the offer that differs, or move it
⚠ No offers on the list.	List Check	Link Price List° from an offer
⚠ No product. / ⚠ Nothing included.	Component Check	Link Product* or Includes*
⚠ A product cannot include itself.	Component Check	Link a different part
⚠ No quantity. / ⚠ No unit.	Component Check	Enter Quantity* or select Unit*

Reference grid captured on 2026-10-28, before the intake views and label updates. Use the current view names in this guide.

Limits of the checks

Checks run on every row, including Draft and Archived ones: the two archived sample offers show ⚠ No seller. The field descriptions ask for a blank check only on Active rows. No check blocks saving, changes Lifecycle Status* or notifies anyone. List Check reads the two rollups Seller (from Offers) and Currency (from Offers) and looks for the “ | “ separator; confirm the rollup aggregation formula in the field settings.