SAP Production Planning Table

production parameter in SchedMargin key?
I know the parameter affection in production,but I am not sure why to define how
many days in each parameter.
for example, release key defined for 10 workdays,but you can release production
order out of the release period randomly.any way to stop release out of the release
period?
For example - Component A has a lead time of 14 days and opening period of 5 days.
Requirement on 12-22-03
Opening Date - 12-01-03 ???
Start Date - 12-08-03 (from requirement date - lead time ?)
Finish Date - 12-22-03 (from requirement date ?)
Why Openning date = 12/01/2003 how system calculate , Could you please explain to
me..
I know that when we run MRP system will check if the opening date is out of open
period system will generate Plan order instead of PR .
The times in the sch. margin key are in workdays. That's how it gets the dates. The
component I was describing originally would have been a purchased part, where lead
time is in calendar days.
The order start date and the order finish date form the framework within which a
production order is to be executed. Since malfunctions and disturbances in the production
process can never be fully prevented, the system uses particular floats in a production
order. The system takes into account so-called "before and after production floats" when
scheduling an order.
The float before production is a start float. It has two functions:
It can compensate for delays in the staging of the material components.
If there is a capacity bottleneck at the work centers involved, the production dates can be
moved forward in the future. In this way it serves as a float for capacity leveling.
The float after production is a finish float. It is used to compensate for unexpected
disturbances in the production process, so that they do not delay the scheduled finish
date.
The floats before and after production are defined for each material using a scheduling
margin key. This scheduling margin key is automatically transferred from the material
master when an order is created. However, you can change the times in the order.
The system calculates the scheduled start of the order by adding the float before
production to the order start date. It calculates the scheduled finish of the order by
subtracting the float after production from the order finish date.