SuiteP additional columns

On SuiteCRM version 7.7.4 (Sugar 6.5.24) with SuiteP theme ON I tried to add additional columns to Project module edit/detail view. I followed

Modifying Layouts to Display Additional Columns

And it seems that this solution works for themes Suite7 and SuiteR but when I switched to SuiteP theme there are still only two columns. Is there anything else i have to change to have an additional column in SuiteP theme? Or is it a bug?