3625777 - javascript base64 encoding not supported in sap fsm business rule expressions

• The issue occurs when trying to use a JavaScript function to convert a string to Base64 encoding in a business rule.
• Error message: "Validation failed: CA-189: Invalid custom rule [invalid JavaScript expression [btoa(XXXX]: ReferenceError: btoa is not defined]" appears when attempting to validate a business rule expression.

• FSM Business Rules

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