Hi there! Withdrawal and allocated quantities distinguish between two concepts - forecast consumption and forecast reduction. The withdrawal quantity represents the amount of forecast which has been "reduced" and the allocated quantity represents the amount of forecast which has been "consumed". Consumption becomes reduction when a sales order / delivery is PGI'd. Or, when an SO is canceled, the consumption is simply reversed and no reduction occurs.
Forecast reduction prevents "over-planning" for a given time period, meaning that the system "remembers" how much was shipped out to the customer so that the forecast shows in the system as "fulfilled".
For example, consider a day which has a forecast of 10. There are open sales orders of 5, and another 3 were ordered and shipped today. Assume also that there is no forward/backward consumption. SO's consume forecast for the same day only. In this case, the allocated quantity would be 5 - for the currently open orders. The withdrawal quantity would be 3. And the remaining unconsumed forecast for the day would be 2.
Not sure why there may be inconsistencies with ECC, however. If you give more specifics on the nature of the discrepancy, I will try to respond with some additional input.
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