Hopefully there is an attachment to the K-1 detailing WHICH credit -

From the K-1 partner instructions:

Code F. Other rental real estate credits.

The partnership will identify the type of credit and any other information you need to figure these credits from rental real estate activities (other than the low-income housing credit and qualified rehabilitation expenditures). These credits may be limited by the passive activity limitations. If the credits are from more than one activity, the partnership will identify the credits from each activity on an attached statement. See Passive Activity Limitations, earlier, and the Instructions for Form 8582-CR for details.