Data retrieve from tables in two diff schema in same db

hi,
i have one db and name is HWRDB, in this i have two schema PRLHEEP and PRLCFFP.
in PRLHEEP my table is NAMAS, and in PRLCFFP also table's name is NAMAS.
i want
if :unit = 'H' then
-- connect to PRLHEEP
select data into some items from NAMAS
eslif :unit = 'C' then
-- connect to PRLCFFP
select data into some items from NAMAS
endif;
plz help me to connect to schema. *** db is oracle db, 10g version***

here is my code,
if :deloan.unit = 'H' then
....... select nmodpay,nbnkacc
.......into modpay, bnkacc
.......from namas where nstfno = :deloan.stfno;
.......select some colums
.......into some items
.......from pafac
....... where pstfno = :deloan.stfno and
elsif :deloan.unit = 'C' then
....... select nmodpay,nbnkacc
.......into modpay, bnkacc
....... from prlcffp.namas where nstfno = :deloan.stfno;
.......select some colums
....... into some items
....... from prlcffp.pafac
.......where pstfno = :deloan.stfno and
in forms builder, i connect to prlheep
when i compile i get errors:
identifier *'PRLCFFP.NAMAS'* must be declared
identifier *'PRLCFFP.PAFAC'* must be declared

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