unlimited field should be tick automaticall while pm order creation in iw31 in service tab line item

Hi,

I have an issue that in pm order with control key pm03, while creating pm order in iw31, user is saying that ; in service tab line item of pm order operation; the unlimited field is getting tick mark automatically. please guide me is it possible to update automaticaaly while creating the pm order.

i am attaching the screenshot of the issue below. pls guide me.

i have analysed and found the possibilities that either manual updation of tick mark while pm order creation or in Material management--- external management--- define screen layout--- we need to put the unlimited field value is manadatory tick while pm order creation.

thanks,

Mastan.