Peoplesoft Inventory Express Issue

When we do the Express Issue ,select one Item ID, simultaneously do the Express Putway use the same Item ID, then save the data in Express Putway page.

Continually go to the Express Issue, input the quantity, then click the save button, the system prompt the error message.

Error message find in the below:

Page data is inconsistent with database. (18,1) .

When trying to save your page data, the system found that the information currently in the database did not match what was expected.
This problem can happen if another user has changed the same information while you were making your changes.