When true, planning assumes infinite inventory. Scope is the fulfillment contexts referenced by fulfillmentCenters when that field is non-empty; otherwise all of the partner's contexts. In the all-contexts case omit productDetails — this flag already assumes every product is infinite everywhere; to supply per-product attributes (e.g. dimensions or weight) set assumeQuantityAvailableInfinite on each ProductDetail instead, which keeps those attributes. When a fulfillmentCenters scope is supplied, productDetails may still carry inventoryStatuses describing OTHER (non-scope) contexts. Defaults to false/null.
