eBay Error 21919309: [item specific] should contain only one value. Remove the extra values and try again.

Why this happens

eBay is restricting how many values you can enter for this Item Specific, based on the category or the product. Why eBay enforces this: Some specifics accept a single value because they describe one fact, such as Age Level or Department. Multiple values are refused. When it usually happens: It usually appears when a supplier feed lists several age ranges or departments in one field.

How to fix it

This error in other languages

German: … darf nur einen Wert enthalten. Entfernen Sie die zusätzlichen Werte und versuchen Sie es noch einmal. French: … ne doit contenir qu'une seule valeur. Supprimez les valeurs supplémentaires, puis réessayez. Italian: … deve contenere un solo valore. Rimuovi i valori aggiuntivi e riprova. Spanish: … solo debe contener un valor. Elimina los valores adicionales y vuelve a intentarlo.