Select drive in TR-DOS

I need select drive from basic, but if I select drive without FDD then trdos show error message ... TAPE LOADING ERROR.

example:
1) eject diskette from drive A
2) write in basic command RANDOMIZE USR 15619:REM:*"a:"

I test TR-DOS 5.03, 5.04T, 5.041, 6.09 and bug is same.
Only Czech version of TR-DOS 5.05 show correct message O.K.