| Program Type | Code | Purpose | Executable? | Typical Usage |
|---|---|---|---|---|
| Executable | 1 |
Reports, standalone programs | ✅ Yes | Reports, jobs, selection screens |
| Include | I |
Reusable code | ❌ No | Shared FORM routines, definitions |
| Module Pool | M |
Dialog screens, GUI transactions | ✅ Yes | Custom SAP GUI apps |
| Function Grp | F |
Group of function modules | ❌ No | BAPIs, reusable logic |
| Subroutine | S |
Collection of FORM routines | ❌ No | Old-style code reuse |
| Class Pool | K |
Global class definitions | ❌ No | OO programming, utility classes |
| Interface | J |
Global interface definitions | ❌ No | Interface inheritance in OO classes |
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