Why did this code not work when trying to use the REPLACE command to replace a field in a different alias than the current alias?

SELECT SomeTableOtherThanMachineSched
*-- Some misc code here

REPALCE MachineSched.status with 'C' <------ (An updateable view)
llUpdate=TABLEUPDATE(1,.t.,'MachineSched')&& update local view
IF llupdate=.f.
MESSAGEBOX('Error updating changes to data table in cmdCheck.click()', 0, 'Error')
ENDIF

*-- Requery local view
cMachNo=thisform.mach_num && Required var for local view
REQUERY('MachineSched') && to refresh data set



Problem:

The REPLACE with 'C' would not 'stick' until I specifically SELECTED the correct view alias first.

This code did work:

SELECT SomeTableOtherThanMachineSched
*-- Some misc code here

SELECT MachineSched
REPLACE status with 'C' <------ (An updateable view)
llUpdate=TABLEUPDATE(1,.t.,'MachineSched')&& update local view
IF llupdate=.f.
MESSAGEBOX('Error updating changes to data table in cmdCheck.click()', 0, 'Error')
ENDIF

*-- Requery local view
cMachNo=thisform.mach_num && Required var for local view
REQUERY('MachineSched') && to refresh data set