What do the Line Status on orders mean?

These are the different options and what they mean:
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​Agreed = the customer has given you a required date but you cannot supply the item for that date and you have provided an alternative date
​Firm Urgent = an urgent firm call-off
​Firm = a firm call-off (definite)
​Material = the customer has agreed to you purchasing the material required to make the item and should they cancel this order then they are still liable for the material costs you have incurred
​Forecast = this call off could be changed / cancelled
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​Note: The above status' do not apply to SIMPLE sales orders. Simple sales orders will only ever have a status of Firm