301 redirect to site problem

[rushy]

Hi. I have set up a 301 redirect in the host webspace to redirect to a pw site on to my other host server. I simply have these 2 lines in .htaccess and nothing else. (There is no pw on this webspace)

RewriteEngine On
RewriteRule (.*) https://my-otherdomain.com/mysub [R=301,L]

On this other server I have pw installed in a folder www/mysub

This works in so far the home page is shown as expected but internal links give internal server error. I suspect because url slugs are referencing the wrong server. Do I need to add rules for this and any idea what rules to add ?

Thanks for any help-