The expression "An item(s)" is invalid on grammar when it refers to the plural meaning at which it turns into "An items". To avoid the possibly vague thoughts for some readers about this, change this into "An item or multiple items", towards which readers are able to comprehend both grammatically and misunderstanding-avoidingly.
The expression "An item(s)" is invalid on grammar when it refers to the plural meaning at which it turns into "An items". To avoid the possibly vague thoughts for some readers about this, change this into "An item or multiple items", towards which readers are able to comprehend both grammatically and misunderstanding-avoidingly.