Manufacturing Calendar not adhered when Creating WO Manually

Hi All,

Inventory Manufacturing have 19th and 20th of Dec set as Off days. When Discrete JOB created manually, the form allows to enter 19th as Start of the Work order.

However, if I create the Sales Order for an ATO item or any item, even I enter 19th as Schedule Ship date, it is scheduling as expected to move the dates to 21st of the Decemeber.

Can we make Discrete Job's validate the dates in the calendar as well. One thing I noticed is the Routing Resource setups are not set as Scheduled to Yes, does this create this discrepancy.