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/*
In many Epicor10 foms,there are controls that cannot be accessd directly because they are not stanard control types.

For example, on the IssueReturn form, the From Warehouse dropdown is a control of type Erp.Adapters.Controls.IRWarehouseCombo. But I am unable to use this control type in the script section in the standard fashion:
  IRWarehouseCombo cbo = (IRWarehouseCombo)csm.GetNativeControlReference("GUID");
  
This makes it difficult to change the value of this field. However, you can do so by 
1. Changing the value of the underlying form data
2. Creating a generic reference to the IRWarehouseCombo element
3. Updating the generic reference

In the following snippet, I am setting the FromWarehouse and the FromBin to the location identified in earlier code, identified as MyWarehouseCode, MyWarehouseCodeDescription, and MyBinNumber.

*/

EpiDataView dvIM = (EpiDataView)oTrans.EpiDataViews["IM"]; // Gets the underlying IssueMaterial data for the form.
Erp.BO.IssueReturnDataSet.IssueReturnRow irr = (Erp.BO.IssueReturnDataSet.IssueReturnRow)dvIM.CurrentDataRow; // Gets the row data and casts it as an IssueRetunRow
irr.FromWarehouseCode = MyWarehouseCode;
irr.FromWarehouseCodeDescription = MyWarehouseCodeDescription; // Needed so the dropdown box shows the correct text for the warehouse
irr.FromBinNum = MyBinNumber;
var cmbWhse = csm.GetNativeControlReference("d8cbd6bd-beed-4ca7-803c-f5a1023e4bbd"); // Gets the IRWarehouseCombo control as a generic Control
cmbWhse.Update(); // Update Warehouse Display
Bin.Update(); // Update Bin Disply

/*
  The OrderAllocAdapter in Epicor is not functional following the standard procedures. Trying to get a filtered list of lots allocated to a job (or order) is next to impossible.
  Fortunately, there is a way to force the OrderAllocAdapter to behave properly. It just takes some extra coding.
  Attribution: From post by user E2BLou on https://www.epiusers.help/t/orderalloc-adapter-getlistoforders-method-whereclause-not-working/61813/4 (Posted Aug 2020, retreived Sep 2021)
*/
OrderAllocAdapter oa = new OrderAllocAdapter(oTrans);
oa.BOConnect();

string where = "JobNum='" + job + "' AND PartNum='" + inpart + "'";
SearchOptions opts = new SearchOptions(SearchMode.AutoSearch);
oa.DefaultSearchType = Erp.Adapters.OrderAllocAdapter.SearchType.SO;
oa.SearchForm = new Erp.UI.Searches.OrderSearchForm();
opts.SearchMethod = new AlternateSearchMethod(oa.GetListOfJobs);
opts.SelectMode = SelectMode.MultiSelect;
opts.PreLoadSearchFilter = where;
oa.InvokeSearch(opts);
oa.OrderAllocationGetRows();

// Use this code to ask the user to confirm before continuing
DialogResult dialogResult = MessageBox.Show("You have selected " + countToRemove + " out of " + rowCount + " rows to unallocate.\r\nAre you sure you want to continue?", "Confirm unallocations", MessageBoxButtons.YesNo);
if (dialogResult == DialogResult.Yes)
{
  // Do whatever
}
else
{
  // Don't do whatever
}