Lookup in Custom Form

[pkirchmaier]

Hi, I need to create a CustomForm in SharePoint Designer for some JQuery Code.
But when I use this forms there no longer Cross-site Lookups. There are the normal Default Lookups.
What do I have to do to get the cross-site lookups back?

Thank you

[Nikita Kurguzov]

Dear pkirchmaier,
Unfortunately, custom forms in SharePoint Designer do not support JSLink which is used to render Cross-site Lookup, it's only supported in default SharePoint forms (and even here, not for every list).

The only option there is for custom forms with Cross-site Lookup is to use Forms Designer, and this is only due to a fact that Forms Designer renders the Cross-site Lookup itself. With Forms Designer, there are very little limitations as to what you can do, since the products are practically designed to work best in pair.