Hi Henk,
In addition to Chau suggestions if the script is generated and the transactions are at the correct places in your colleague script, than the easies approach you can try is to use the same recording options he has used.
You should try using different recording options. You can start with Recording options -> Recording -> URL mode. In “Advanced URL” button do not select any of the options.
Under Recording options ->Port Mapping -> Capture level"you can try with "WinInet level data" or "Socket level"
"Socket level and WinInet level data" option in LoadRunner should be used only as an exception. http://support.openview.hp.com/selfsolve/document/KM1268690
You can find additional information about HTML and URL mode in the following KM http://support.openview.hp.com/selfsolve/document/KM207161
Kind regards,