[Request for External] Report 399 "Remittance Advice - Journal" PaidAmount variable - change to Protected

[melpbc]

Describe the request

Please change the scope of the PaidAmount variable in Report 399 "Remittance Advice - Journal" from Global to Protected.

Additional context

This variable is needed to perform other calculations against the invoice, for example to determine any payment amounts previously applied to the invoice, prior to the current payment being printed. Without access to this variable, the PaidAmount value would need to be recalculated, resulting in duplicate (redundant) code.