I feel the following text from ugii_env.dat file will help.
# Drafting text has never supported tab (\t, \011) or line feed (\n, \012) characters.
# Consequently, these characters are no longer allowed in Drafting text.
# These characters should neither be entered interactively in the Annotation Editor
# nor included in text read from a file such as text read by the "Insert from File" function
# in the Annotation Editor, or a file specified for the GRIP NOTE command.
# To support legacy file text that includes these characters, the
# UGII_DRAFT_REMOVE_UNSUPPORTED_CONTROL_CHARACTERS can be set to either TRUE or true.
# Setting this variable to true will cause all tab and line feed characters included
# in the text to be automatically removed. To use this environment variable simply remove
# the "#" comment character from the front of the declaration below.
#
# To have tab and line feed characters permanently removed from a note template file:
# 1) run Unigraphics with UGII_DRAFT_REMOVE_UNSUPPORTED_CONTROL_CHARACTERS=TRUE,
# 2) Open the Annotation Editor
# 3) Use the "Insert from File" function to read in the note template file.
# A status message should be displayed indicating that control characters were removed.
# 4) You can optionally try placing the note to verify that an
# "Invalid text in Annotation Editor" message is not reported and that the note can
# be created.
# 5) Use the "Save As" function to save the note template text back to the file
# without the control characters.
#
#
#UGII_DRAFT_REMOVE_UNSUPPORTED_CONTROL_CHARACTERS=TRUE