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Assignments in ABAP Release 7.53 ITOC
ABAP_MODIFICATION_NN Convertibility of Structures The conversion rules for flat structures are based on their fragment views, where each alignment gap is considered as a fragment. Alignment gaps arise from the alignment requirements of the component's data types. For character-like components, the alignment requirement depends on the character representation:
For character representation UCS-2 used by the ABAP programming language, the memory address of character-like data objects must be divisible by 2.
For other character representations there are other alignment requirements. For example, the non-Unicode character representation ASCII has no alignment requirement while the Unicode character representation UTF-32 requires a divisibility by 4. Before only Unicode systems were supported, the conversion rules for structures had to take all possible alignment requirements for characters into account, regardless of the actual length of a character in its character representation. Meanwhile, only Unicode systems are supported. The system codepage is UTF-16 and its subset UCS-2 is supported in ABAP language. Any character is represented by 2 bytes and the alignment requirement is always a divisibility by 2. Because of this, the conversion rules for flat structures can be less strict than before and the new determination of possible alignment gaps was introduced in ABAP_RELEASE 7.53. For example, the following assignment between two flat structures was not possible before ABAP_RELEASE 7.53 but is possible now. ABEXA 01442 In the included substructure incl1, the character component has the same alignment as the integer component and there is no alignment gap. But as long as non-Unicode Systems were supported, an alignment gap had to be assumed behind the included structure in order to make the program executable in Unicode systems as well as in non-Unicode Systems.
Latest notes: When downporting programs from higher to lower releases, syntax errors might occur in the lower releases because of the stricter rules there. ABAP_HINT_END
