I tried and failed.  I attached Form 1116 Schedule B PDF attachment and unchecked the e-file diagnostic (a first for me) and e-filed the return.  It was rejected.

 Error F1116-004-02: If Form 1116, 'Form1116ScheduleB' must be attached to 'ForeignTaxCrCarrybackOrOverAmt' and 'ForeignlncmSection951Alnd' must not be checked.

A PDF attachment file is required to file this return electronically. The functionality of attaching the PDF attachment file "Form1116ScheduleB" is not currently available.

The functionality will be added in the future release. Please check form availability and wait until Schedule B (Form 1116) is in the product.