Reg.. Display of errors dynamically using field-symbols

I want to display errors starting from A-Z and 0-9 dynamically on the top-of-page.

suppose in file-1 i have some 5 errors like

sales org missing

no order type

no sales employee

no CRD

no CRD date

then it has to display the errors as

A-sales org missing

B-no order type

C-no sales employee

D-no CRD

E-no CRD date.

in the file-2 i have some 3 errors like

plant is missing

sold to party is missing

ship to party is missing

it has to display the errors as

A-plant is missing

B-sold to party is missing

C-ship to party is missing