ASSUME (Assume) keyword for display files

Such a record can also be defined, with the KEEP keyword, in another display file. That other display file can be closed before this file (in which you are specifying ASSUME) is opened.

This keyword has no parameters.

Specify the ASSUME keyword for at least one record format within the display file so that the IBM i operating system does not erase the display when the file is opened. In addition, specify the OVERLAY keyword with the ASSUME keyword to prevent the IBM i operating system from deleting the display when your program sends the first output operation after opening the file.

If you use the ASSUME keyword, at least one field in the record must be able to be displayed. If more than one record with the ASSUME keyword exists, they must occupy unique display lines.

For the IBM i operating system to process the data correctly, your program must specify the record format name containing this keyword.

The ASSUME keyword is not needed if the record format you are defining is in a shared file (SHARE(*YES)) parameter specified on the Create Display File (CRTDSPF), Change Display File (CHGDSPF), or Override with Display File (OVRDSPF) command).

This keyword cannot be specified with any of the following keywords:

A warning message is issued at file creation time if the ASSUME keyword is specified on a record with the DSPMOD keyword. At run time, the ASSUME keyword is ignored when the display mode changes.

A file with the ASSUME keyword will be opened to the display size of the file with the KEEP keyword.

Option indicators are not valid for this keyword.