Regarding local application(templates)

2.3.8
CHECKFILE Array
This array is a dimensioned array that defines file look-ups to be performed when data is input. The corresponding variable for the id is ID.CHECKFILE. For new applications, the API Field.setCheckFile should be used, and the information here is for reference to older applications built before the new APIs were available. As such, DO NOT use the CHECKFILE array for new applications.
The check file processing will validate the input as having an existing record on the file and will also retrieve the specified field of that record which is then displayed as enrichment next to the entered field. The elements of the check file table are a dynamic array that is set up as follows:
Field 1
The application name of the file to be checked, e.g. CUSTOMER.
Field 2
The number of the field to be returned as enrichment or to be used as the id for the next file read. This MUST be a file name defined in the corresponding file layout for the check file.
Field 3
This field is used to define 4 optional parameters. These are separated by '.' and should be assigned as follows:
Subfields 1, 2 and 3
Null. These subfields are not used.
Subfield 4
'D' The id is date associated and the record with the most recent date should be used. The date is in YYYYMMDD format.
'YM' As for 'D' but the date is in YYYYMM format.
null =No date used.
Example
To encourage re-use, check file definitions for tables should be defined in the initialise section of the .FIELDS and then referenced later.
CHK.ACCOUNT = "ACCOUNT": FM : AC.SHORT.TITLE: FM :"L"
CHECKFILE(Z) = CHK.ACCOUNT

This is what it does :

Z += 1 ; F(Z) = "XX.SOURCE" ; N(Z) = "35.." ; T(Z) = "A" ; CHECKFILE(Z) = "CGIX.SOURCE":FM:1

results in :





For ID.CHECKFILE there can't be a drilldown as the ... will show existing records in the application, here the checkfile is only for validation.

As mentioned it won't work for ID.
But maybe you can use an ENQUIRY to list the FTs and then have a drilldown to create the record in your local app?