Comments Column in Transportation Logistic Window
Details
In Warehouse > Transportation logistic window > Warehouse Schedules section, the C column will indicate if the Warehouse Schedules has Order header comments entered or not as shown in image below:

If the C check box is selected, then it indicates that the Warehouse Schedule has Order level comments defined and on highlighting such record the comments defined will be displayed in the Order Comments section.
If the C check box is de-selected, then it indicates that the Warehouse Schedule does not have Order level comments defined and on highlighting such record the Order Comments section will be blank.