insert date value using form personalization in Descriptive flexfield has value set(FND_STNDRD_DATE)

We are using Oracle Applications : 12.2.7

Purchasing module

Requirements are :

1- create flexfield in approved list supplier the type of it to be Standard date

2- insert default value when create record in the form in this flexfield to be sysdate+30 days

Steps Done :

1- I created new flexfield in approved list supplier and added value set (FND_STANDARD_DATE)

2- Create personalization in approved list supplier to default value of this flexfield to be sysdate+30

Behavior :

The value defaulted in flexfield will be in wrong format

So How can we set the value in flexfield So that it will be stored correctly based on FND_STANDARD_DATE