Use of "Request Taker" role type

Hello All, I am new at Ofbiz. I am just go through Party manager of Ofbiz. I just want to know that "What is the use of *Request Taker (roleTypeId = "REQ_TAKER**") * role of a party" and when we can assign this role to any party. Please give me detail of same. Thanks in advance. -- Thanks, Dhi

Difference between Sales Order and Purchase Order

Hello All, Can anyone tell me about "Difference between Sales Order and Purchase Order" as development point of view. What things I have to keep in mind when I create any one of them. Thanks, Dhiraj