Displaying data after zoom on session

Hi,

I have developed new maintain session on which input will be project No. and based on that i want to display all the invoice numbers for that project and user will enter RA Bill no. against any invoice no.
In this case, only last invoice is getting displayed. How can I display all the invoices related to project.

Screenshot of session is attached.
Below is my code:

Please help

field.cprj:
after.input:
serial.num = serial.num + 1
get.details()
get.contract()
get.invoice.number()
sern = serial.num
serial.num = 0


function get.invoice.number()
{
select cisli310.*
from cisli310
where cisli310.cprj = {:cprj}
selectdo
invn = cisli310.tran&(str$(cisli310.idoc))
display.curr.occ()
select cisli305.*
from cisli305
where cisli305._index1 = {:cisli310.sfcp,:cisli310.tran,:cisli310.idoc}
selectdo
if cisli305.stat = tcsli.stat.posted then
flag = true
endif
bdte = cisli305.idat
selectempty
bdte = 0
endselect
selectempty
invn = ""
bdte = 0
serial.num = 0
sern = 0
endselect

}

Attached Images

Invoice_no.PNG (21.0 KB)