Why do I see an "Input up to 5 valid PMIDs" error when I am trying to place an article request with a PMID that exists PubMed?

The article data that DOCLINE accesses lags approximately 24 hours behind the PubMed website. This may cause issues requesting the articles most recently added. This problem will be resolved when the new NCBI API becomes available.

In the meantime, users may request the desired article using Journal UI ordering or try again tomorrow when the selected PMID should resolve. 

Journal UI ordering can be initiated from Journals Search results (Journal Holdings view) as well as from Borrow menu.