E-commerce: Offers and orders via internet

The system can handle offers and orders via Internet. Quantities are from stock inventory or production plans. Provided one partner works with both types of quantities this must know that they are managed separately. For planned quantities, time horizons and levels are possible to select. The time horizons may be: present and next. The levels may be: month, quarter and year. Every level supports subintervals of time, namely: decades, months and quarters correspondingly. The quantities set is kept coherent over time horizons and levels. Assistance for editing offers/orders is provided, with information about necessary/available quantities and cumulated offers/orders at a given moment.