Select the root node in the Object Type Definition pane of the Message Library Editor.
Double-click the delim properties field in the Properties pane.
An ellipsis (...) button appears in the field.
Click the ellipsis button.
The Delimiter List Editor appears.
Double-click any field in the Delimiter List Editor on any level to make the field editable or to display a list of options.
For Level 3, do the following:
Double-click the Delimiter Bytes field for level 3.
Change the current delimiter character to a pound sign (#), Tab to the next field, and then click OK.
The delimiter for all level 3 nodes in the Message Library is now a pound sign (#), unless it is specified differently for a specific segment. The figure displays an example of various levels in the Object Type Definition tree, from the Root node.