Dynamic Action to delimit P & S relationship.

Dear Experts,

we have requirement where after running Repatriation Action(03) the relationship between object P & S should get delimited i.e. S = 9999999
Note: i already suggested client to put S = 99999999 while running the action (it works too) but client wants it to be done automatically.

so i created below Dynamic action to achieve the same but its not working...

MASSN  04       P             T0000-MASSN= ‘03’
MASSN  04       I              INS,0001,,,(P0000-BEGDA),(P0000-ENDDA)/D
MASSN  04       W           P0001-PLAN=’99999999’

Can you please let me know, if i am missing something?

like do i need to default the values for all required field of IT0001? or do i need to put a check for tcode=pa40...?

Thanks in advance.

Regards,

Kush