Enable BNE / WebADI debug trace

Instructions for BNE debug (in R12.1.3): 
1) Login to System Administrator Responsibility.
2) Open the System -> Profiles form.
3) Search for %BNE%LOG% in the profiles.
This will return three profiles:
BNE Debug Log Level -- This should be set to "TRACE" (default "ERROR". all caps)
BNE Debug Log Filename -- The log file name should be specified here (eg: "bne2018.log")
BNE Debug Log Directory - -The log file directory should be specified here.
NOTE: The log file should exist, even if empty. Application will not create a new file. Create an empty log file at the location specified in BNE Debug Log Directory like (eg: "bne2018.log"). A services recycle may be needed to make the changes effective.

Once login as System Administrator, paste below URL to same browser window to view details, including the log:
https://hostname.domain:portnumber/OA_HTML/BneAdminServlet

https://hostname.domain:portnumber/OA_HTML/BneAdminServlet?bne:action=log-first&bne:lines=10
https://hostname.domain:portnumber/OA_HTML/BneAdminServlet?bne:action=log-last&bne:lines=10

To reproduce an issue:
(a). Click the "clear-cache" link.
(b). For the attribute "log-set-level" (Current JVM only) , click on TRACE
(c). Run through reproducible case
(d). examine/upload the log

All BNE profile settings in my instance:

NAME	PROF_LEVEL	PROFILE_OPTION_VALUE	DESCRIPTION
BNE: ALLOW MAX DELIMITER	SITE	Y	To Allow maximum delimiter character to import text files in the integrator.
BNE Allow No Security Rule	SITE	N	Allow applications that have not defined a security rule to function
BNE Allow Set Parameters	SITE	Y	Controls access to the Upload Parameters window
BNE Allow Set Parameters	App:IGS	Y	Controls access to the Upload Parameters window
BNE Disable	NOT SET	NOT SET	Disables all Web ADI functionality
BNE Viewer Displays Image	SITE	Y	Excel Viewer does display default FND display image in WebADI documents created
BNE Document Lifetime	NOT SET	NOT SET	How long do documents live before they are automatically disabled.
BNE Enable Digital Signature	SITE	N
BNE Enforce Parameter Values	NOT SET	NOT SET	Sets whether a user can make an alternate value selection where the request parameter is not valid
BNE Offline List of Values Limit	NOT SET	NOT SET	Limit on the number of values to be downloaded for an offline List of Values
BNE Redirect Portal URL	NOT SET	NOT SET	URL of location Web ADI will redirect to.
BNE Debug Log Filename	SITE	bns2018.log	Name of the Web ADI log file.  If not set, file name is bne.log
BNE Debug Log Level	SITE	TRACE	Level of logging recorded in the Web ADI log file
BNE Debug Log Directory	SITE	/path/to/utl_dir	Directory for Web ADI log file on application server
BNE UIX Base Path	NOT SET	NOT SET	Web server path to the uix/cabo base.
BNE UIX Physical Directory	NOT SET	NOT SET	Physical directory that is mapped to BNE_UIX_BASE_PATH.
BNE Upload Batch Size	SITE	200	Number of uploaded rows in each batch sent from the middle tier to the database
BNE: Enable Upload Compression	NOT SET	NOT SET	Enable Upload Compression for the Instance
BNE Upload Staging Directory	SITE	/path/to/bne/upload	Physical file system directory for upload files
BNE Upload Text Directory	NOT SET	NOT SET	Physical file system directory for imported text files.
BNE Excel Worksheet Maximum	NOT SET	NOT SET	Allows users to set the maximum number of worksheets for a workbook
BNE XML Response Compression	NOT SET	NOT SET	Allows compression XML data