Hi,
You can enter the Security Prices in FW17. FW17 always stores market prices based on Class and exchange. In your case, you can define a dummy exchange and assign it in your ID and then maintain the prices based on the Price type (Spot, bid ask etc) maintained in PMP or company code settings in TRM. TPM1 will always refer to FW17 for security Valuation.
Regards,
Nikhil