What are the difference between basic scheduling and lead time scheduling?

Basic Scheduling 

1. Separate Scheduling  for planned orders
2. Exact to days
3. Basic dates are calculated (Order start date opening date and finish date) opening date is a date in future were that planned order should be converted to production order
4. No calculation of  Capacity requirements

Lead time scheduling 

1. Used for production orders and  Routing
2. Exact to seconds 
3. Targets dates are calculated 
4. Capacity requirements are calculated
5. In house production time and float before production and float after production time is taken (schedule margin key) 
6. Lead time scheduling is calculate using time from routing 
7. With in Lead time Scheduling there are two type of scheduling
- Back ward Scheduling 
- Forward Scheduling
8. Customizing setting for lead time scheduling is - go for IMG  activity and  there “ Define  scheduling parameters for planned orders”

When do planning in MRP with single–item, multi-level planning in the initial screen and in that if you go to MRP Control Parameters and then to scheduling if you 
Select = 1 (basic dates will be determined for Planned Orders) 
Select = 2 (lead time scheduling and Capacity Planning)

Please note when you do lead time scheduling you need to maintain:
1. Queue time
2. Wait time
3. Setup time
4. Operation time
5. Teardown time 
and also you need to maintain in-house production time in material master.

Get help for your SAP PP Problems
SAP PP Forum - Do you have a SAP PP Question?

SAP Production Planning Books
SAP PP Certification, Interview Questions and Configuration Books

SAP PP Tips
SAP PP Tips and Production Planning/Control Discussion Forum

Best regards,
SAP Basis, ABAP Programming and Other IMG Stuff
http://www.erpgreat.com