Problem with prifix number

[MDTAREQ]

how can i add prifix number to any number that come from outside
for example :

number: 050xxxxxxx

should come on the screen ( 9050xxxxxxx )

Help plz

 

[batkotivalio]

Try this
NUTRI:ENTRY=0,CNVTYP=2,NUMTYP=0,PRE=0;

 

[MDTAREQ]

<NUTRI:ENTRY=0,CNVTYP=2,NUMTYP=0,PRE=0;NOT ACCEPTED
REDUNDANT ENTRY

<

Not working and i need explanation about the code

Thanx

 

[MDTAREQ]

I tried this code and everything working fine

NUTRI:ENTRY=05,CNVTYP=2,NUMTYP=2,PRE=90,TRC=1;

Thanx