Industrial buyers on the river
The paper mills and gas operations bring contractors working to audited terms with purchase orders and gate registers. An invoice carrying both GSTINs, HSN codes, line-wise tax and the PO reference is what clears, and the challan reconciles against their store.
Delta agriculture behind the district
The Godavari delta funds a great deal of house construction, concentrating demand after the crop rather than spreading it. Last year's movement over the same weeks is the basis for that half of the stocking decision.
River crossings and delivery time
Deliveries across the delta take longer than the distance suggests, and monsoon affects routes. The challan with the date, vehicle, destination and receiver, held against the party, is what settles a question weeks later.