What is the difference between Blanket Purchase Order and the Framework Order.

In general the Blanket POs are used for consumable materials such as Xerorx papers with a short text (does not need to have Master Record) with Item Category ' B' i.e.limit, where in the PO validity period as well as the limits are to be mentioned for the simplicity of procurement.The doc type is 'FO' (Framework Order). The GR or Service Entry for the PO are not necessary in case of Blanket POs as well as one need not to mention the account assignment category during creation of PO it can be 'U'-unknown & can be changed at the time of IR.