PO Page Composer - Conditional EL expression logic

Summary:

Hi, Requesting help on writing condition EL expression logic for PO page customization

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We have a requirement to make Source Agreement field required on only Blanket PO and Contract PO. I have added the conditional EL expression in below format but it's not working. Can you confirm me if I'm missing something. It's fine when the condition is only one PO. Need to apply condition for two POs.

#{bindings.DocStyleName.inputValue == 'Blanket Purchase Order && Contract Purchase Order'}

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