How to make change the Extension definition field data type

Hi All

I want to change the String data type  length of some custom field in SAP Sourcing application under Master agreement.

But I am not able to change the length of that field in extension definition even in Edit mode(standard behavior may be)

As the particular field is integrated through PI to ECC I can not  simply inactive and make the new one.

So could some one help me or provide me any workaround to make it possible without making new filed and again integrate the same  to ECC?

Could we can achieve this using script in script definition?

Thanks for your kind feedback.

Thanks

Peeyush Ranjan