Input variables =?iso-8859-1?Q?don=B4t?= receive values in AFTER FIELD clause after recompiling 4GL sources on new platform

Hello, situation: I´m recompiling sources formerly developed on Siemens MIPS/RM platforms with 4GL 4.1X developement tools and Online 5.x database server. The new platform is an Alpha AXP Cluster with ISD 7.3X database server and 7.2X developement tools. Recompiling is fine. But the application doesn´t work as expected. What happened: INITIALIZE l_a1, l_a2 TO NULL INPUT l_a1, l_a2 WITHOUT DEFAULTS FROM sr_field.a1, sr_field.a2 AFTER FIELD a1 IF l_a1 < 0 THEN DISPLAY "ERROR" NEXT FIELD sr_field.a1 END IF END INPUT I typed in some value into the "a1" field and then RETURN. But l_a1 in the AFTER FIELD clause remains NULL until i explicitly call GET_FLDBUF. What is the explanation for the strange kind of behaviour. I´ve no idea what i´m doing wrong. Greetings, Joerg