Copy EFF attributes from original sales order when creating Return Order

Summary: We are using OM extension to copy EFF attributes from original sales order header and line to RMA order, issue is that our line level attributes are populated only on one line which is shippable lines rest all lines are BILL only lines. The following code works when I create return for for only shippable line but fails when I create Return for All lines which includes both shippable and billable lines, how can we utilize the code below for only shippable line and not get error

import oracle.apps.scm.doo.common.extensions.ValidationException;
import oracle.apps.scm.doo.common.extensions.Message;