Through Solomonic Travel, people are able to enter into someone's dream through a passage. My interpretation (extremely fallible) is that they enter physically and thus, are not able to enter into the dreamscape. Is this a correct interpretation of dream magic and Solomonic Travel?
This seems a reasonable conclusion given the description of the Dreamscape in TM:Re pp. 111 and that Solomonic Travel seems to apply to your physical form.
There might be ways to "break" this through jinn powers that deal with dreams or in other ways.
Sure enough, physical travellers cannot enter the Dreamscape. "Open a passage" in the Solomonic Travel description makes it sound like Sahirs should travel physically into dream, rather than as spirit.