Getting this error in QD 7.x please enter a valid value for characteristic 0COSTELMNT

Hi Experts,
I am modifing an Z query in develoemnt environment and I am getting this error:
please enter a valid value for characteristic 0COSTELMNT

I don't know why is showing this error, I delete the row that I've created but is still showing altought the QD let save the query normally.
I am afraid that this can generate an issue in quality system ann hen production.
Could you tell me what are you thought?

Thanks