Here is the patch function I wrote. Hopefully this helps.
Patch(
'request',
Defaults('request'),
{
'Start Date': DatePickerCanvas3.SelectedDate,
'Work Order Number': DataCardValue2.Value,
'Hour Type': DataCardValue4.Selected,
Completed: DataCardValue5.Selected,
User: DataCardValue6.Value,
'Hours Worked': Value(DataCardValue3.Value),
'Start Hour': DropdownStartHour.Selected,
'Start Minutes': DropdownStartMins.Selected,
'Completed Date': DatePickerCanvas1.SelectedDate,
'Completed Hour': DropdownCompletedHours.Selected,
'Completed Minutes': DropdownCompletedMins.Selected,
Comments: DataCardValue8.Value,
'Building Lookup': DataCardValue1.Selected
}
);