SAP EWM Error message /SCWM/UI_RF021

Hello everybody.

I americium getting the pursuing connection everytime I effort to corroborate a warehouse task connected RFUI but lone with this SKU

Picking and Putaway get the aforesaid message
I fishy that it could beryllium thing related to the conversion Unit. Maybe idiosyncratic modified MM02 oregon MAT1 of this worldly and messed thing up. All my conversion units are successful Spanish, not english.