Data points for MBUS datasource cannot be added

[slsimic]

After adding MBUS data source, setting IP address, port and search range for primary address, and when search is done, I get MBUS device recognized, having all of the readings correct on the expanded tree. But when I try to add a point by clicking "add" icon on the right side of the values, nothing happens. No data points are added in the list below. I've noticed that after I click on the small "add" icon, in the localhost_access_log the line with an error "POST /ScadaLTS/dwr/call/plaincall/MiscDwr.jsError.dwr HTTP/1.1" 200 89

"POST/ScadaLTS/dwr/call/plaincall/MiscDwr.doLongPoll.dwr HTTP/1.1" 200 88 "GET/ScadaLTS/data_sources.shtm HTTP/1.1" 200 43279 "POST/ScadaLTS/dwr/call/plaincall/MiscDwr.terminateLongPoll.dwr HTTP/1.1" 200 90 "POST/ScadaLTS/dwr/call/plaincall/MiscDwr.doLongPoll.dwr HTTP/1.1" 200 103 "GET/ScadaLTS/dwr/interface/DataSourceListDwr.js HTTP/1.1" 200 3062 "GET/ScadaLTS/dwr/interface/MiscDwr.js HTTP/1.1" 200 4379 "POST/ScadaLTS/dwr/call/plaincall/DataSourceListDwr.init.dwr HTTP/1.1" 200 "GET/ScadaLTS/data_source_edit.shtm?dsid=3 HTTP/1.1" 200 96236 "POST/ScadaLTS/dwr/call/plaincall/MiscDwr.terminateLongPoll.dwr HTTP/1.1" 200 89 "POST/ScadaLTS/dwr/call/plaincall/MiscDwr.initializeLongPoll.dwr HTTP/1.1" 200 102 "GET/ScadaLTS/dwr/interface/MiscDwr.js HTTP/1.1" 200 4379 "GET/ScadaLTS/dwr/interface/DataSourceEditDwr.js HTTP/1.1" 200 30026 "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.editInit.dwr HTTP/1.1" 200 198 "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.searchMBus.dwr HTTP/1.1" 200 89 "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.mBusSearchUpdate.dwr HTTP/1.1" "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.mBusSearchUpdate.dwr HTTP/1.1" "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.mBusSearchUpdate.dwr HTTP/1.1" "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.mBusSearchUpdate.dwr HTTP/1.1" "POST/ScadaLTS/dwr/call/plaincall/DataSourceEditDwr.getMBusResponseFrames.dwr "POST /ScadaLTS/dwr/call/plaincall/MiscDwr.initializeLongPoll.dwr HTTP/1.1" 200 87 "POST /ScadaLTS/dwr/call/plaincall/MiscDwr.jsError.dwr HTTP/1.1" "POST/ScadaLTS/dwr/call/plaincall/MiscDwr.doLongPoll.dwr HTTP/1.1" 200 87

If there is another log file to look into to help resolve the problem, please let me know.