it seems that SIM gets cost pricing wrong 50% of the time, we were wrongly understanding that we could trust SIM data, but it seems half of our suppliers give "generic pricing" (i.e. standard trade prices) to SIM, rather than ones specific to each company. we all know that margins are based on doing deals with suppliers, and margins change depending on what stock-ins and commitment you make to a brand/season. this means we are constantly manually updating cost prices, and it makes no sense for this to be so complicated when all we should need to do is maintain a chart of "brand margins" - i.e. if you know you get 30% margin for a brand, then why isn't this wonderful system able to calculate the cost price if we each maintain a simple look-up table of supplier/brand/margin. that way we are back in control of understanding if the data feed is reliable.