Where the taxable field on Product Information Management > Item > Sales and Order Management

Hi,

After I filled in the Output Tax Classification Code field in Product Information Management > Item > Sales and Order Management and then saved it, an error occurred: "You can't set the Output Tax Classification Code value because the Taxable attribute is set to No. (EGP-2776301)." However, I couldn't find the Taxable attribute field. Please tell me where the Taxable attribute field is located? so I can set it to Yes.

Thank you