Preparing SambaPOS to Sell Coffee Coupons

Hello Goodnight. I am new to the forum and using the system I am trying to learn following the tutorials, very good indeed, that there is here. for the moment I have assembled the Preparing SambaPOS to Sell Coffee Coupons, everything works correctly according to the step by step except that when the coupon is created, when I will edit the entity list the coupon field number does not take the value generated by the entity, I have checked several times and I do not see the error, so I come here to ask for help from the experts. Thank you so much.