Generate Orders for Subassembly - How Child Order Dates are Determined

​@danielklumpp 

I do not think there is a setting you are missing.  The due date field was introduced in 25R1 for people that do use APS so when the constraint date had to change based on scheduling capacity, visibility of the due date of the demand wasn’t lost.

It is possible logic changed - I assume the behavior you are expecting/desire was different in an previous version?  could you please share that version?

We recently started using ‘Generate Orders for Subassemblies’, so I’m guessing the logic has not changed from a previous version.

I’ll convert this to an idea.  Essentially I’m looking for the system to offer the same check box that is afforded to the MRP system for child orders created from screens outside of the MRP system: 

This new checkbox would be called ‘Use Order Start Date for Generating Production Orders’ (which applies to when child orders are created from Critical Materials, Create Production Orders, Generate Orders for Subassemblies, etc.).  The same logic for the ‘Use Order Start Date for MRP’ would apply.

​@angierowley75 

After more testing, I do actually believe logic of how child order dates are determined changed somewhere between 24R2 and 25R2.  I did not find anything in the release notes speaking to this specifically, although I think the introduction of ‘Due Date’ in 25R1 may have introduced an unintentional logic change in how Constraint Dates are calculated.

Here’s how child order dates were determined on 24R2 when using Critical Materials to generate child orders:

Notice that the End Date of the child order is pegged to the Operation start date.

Here’s how child order dates are being determined on 25R2 when using Critical Materials to generate child orders:

The End Date of the child order is not pegged to the Operation start date like it was in 24R2.

It is now pegging to the Order start date, not the Operation start date:

Also notice that the ‘Use Fixed Mfg Lead Times for Order Dates’ checkbox is UNchecked on the child order, even though in Production Preferences we have it checked.

Please answer the following questions:

1. Was the logic change purposeful or is this an error?
2. If purposeful, it did not make it into the release notes, unless I am misunderstanding the text in the Due Date introduction in 25R1?
3. I thought the ‘Use Fixed Manufacturing Times’ checkbox was populated for generated child orders based on the setting in Production Preferences.  Is the logic now that this checkbox is populated based on the state of the checkbox in the parent order from which the child orders are generated (we do manually uncheck the ‘Use Fixed Mfg Lead Times for Order Dates’ in our top level order, but in the past all of the child orders had the box checked)?

For infinite scheduled manufacturers who like to peg child order dates to Operation Dates instead of Order Dates, this has big scheduling and financial implications.  All of the sudden their subassembly and component part work centers will be expected to complete ALL child orders before the beginning of the build of the top level item (Product).