I believe it is more related to your Feature Code, the limit for a command line is 1000 characters or close to it. Your command line to store ML20E is not close to that.
I created an input file from ML20E and changed the Feature Name which was quite long and more of a description that a feature name.
See my input file below:
$ Job Name: 999
$
$ -- COGO CHAIN COMMANDS -- generated by pattern: ML20E
$
SET FEATURE ADD "DEFAULT"
$ Chain ML20E
STO POI 368 N 1022789.8469175000 E 2121516.2497792002 STA 2141.1180000000 ELE 0.0000000000
STO POI STAEQU2 N 1022654.3699209051 E 2123491.8491483773 STA 4245.3551003624
STO POI 369 N 1022660.7959127000 E 2123501.9835760002 STA 4257.3551001037 ELE 0.0000000000
STO POI STAEQU3 N 1024995.1571760291 E 2127251.5446849866 STA 8675.3299003624
STO POI 370 N 1025000.6098449000 E 2127262.2343239002 STA 8687.3298994423 ELE 0.0000000000
STO POI STAEQU4 N 1028824.7664544043 E 2133154.9406093168 STA 15842.1136003624
STO POI 371 N 1028835.6917449000 E 2133159.9042779999 STA 15854.1135994961 ELE 0.0000000000
STO POI 372 N 1036762.4031902000 E 2148603.0516901002 STA 34221.5492136133 ELE 0.0000000000
STO CUR ML20E_3 PC N 1022700.7454449000 E 2121659.5241490998 DB 121.8772332577 D 2.1542471691 DEL -5.2499865207 STA PC 2309.8385307295
STO CUR ML20E_4 PC N 1022581.6998373000 E 2121872.0758846998 DB 116.6272467370 D 3.5000069999 DEL -47.7364458461 STA PC 2553.5425307495
STO CUR ML20E_5 PC N 1022506.7358025000 E 2123199.6505849999 DB 68.8908010000 D 3.4745372602 DEL -11.2685820000 STA PC 3917.4382557432
STO CUR ML20E_10 PC N 1024664.8152860000 E 2126662.5212622001 DB 57.6222190002 D 0.9382466326 DEL 5.3521457598 STA PC 7999.6928874302
STO CUR ML20E_15 PC N 1027239.4379550000 E 2131651.3260924998 DB 62.9743647600 D 1.7500034997 DEL -38.5407223158 STA PC 13614.4464862264
STO CUR ML20E_201 PC N 1030097.0406323998 E 2133732.9707753002 DB 24.4336424442 D 2.9083332684 DEL 30.2887853756 STA PC 17239.5399693640
STO CUR ML20E_202 PC N 1030890.4305199519 E 2134388.8078243872 DB 54.7224278198 D 2.9083332684 DEL 0.3490004809 STA PC 18280.9882003623
STO CUR ML20E_23 PC N 1031616.0990705000 E 2135427.8608070998 DB 55.0714283008 D 0.2500005000 DEL -3.2037279205 STA PC 19548.3579699620
STO CUR ML20E_26 PC N 1032697.2669524000 E 2136843.6990144001 DB 51.8677000000 D 0.5000000001 DEL 1.8541970000 STA PC 21330.4483838942
STO CUR ML20E_271 PC N 1032921.4931555000 E 2137139.0504469001 DB 53.7218970000 D 0.5000000001 DEL -1.7934785829 STA PC 21701.2877838610
STO CUR ML20E_272 PC N 1033138.2259469812 E 2137424.8458438874 DB 51.9284184171 D 0.5000000001 DEL -0.0607193360 STA PC 22059.9835003623
STO CUR ML20E_301 PC N 1035428.1444359999 E 2140341.9092895999 DB 51.8676990811 D 2.0000040001 DEL 31.8359150016 STA PC 25768.4853339170
STO CUR ML20E_302 PC N 1036022.2455829915 E 2141796.6685767826 DB 83.7036140827 D 2.0000040001 DEL 0.2428747261 STA PC 27360.2779003623
STO CUR ML20E_33 PC N 1036201.7408359000 E 2143489.0000538002 DB 83.9464888088 D 0.4999999521 DEL 5.7192463271 STA PC 29062.1017740468
STO CUR ML20E_36 PC N 1036268.4126912000 E 2145139.4605907998 DB 89.6657351359 D 0.5000010000 DEL -9.9032648792 STA PC 30714.8217870001
STO CUR ML20E_37 PC N 1036450.6539169000 E 2147109.2325908002 DB 79.7624702567 D 0.3333333305 DEL -1.9084941690 STA PC 32695.4708015227
STO CHA ML20E 368 CUR ML20E_3 CUR ML20E_4 SHIFT CUR ML20E_5 STAEQU2 369 CUR ML20E_10 STAEQU3 370 CUR ML20E_15 STAEQU4 SHIFT 371 CUR ML20E_201 CUR ML20E_202 CUR ML20E_23 CUR ML20E_26 CUR ML20E_271 CUR ML20E_272 CUR ML20E_301 CUR ML20E_302 CUR ML20E_33 CUR ML20E_36 CUR ML20E_37 372 AS IS
$
I then ran that input file into the job009.gpk file and overwrote the corrupt ML20E chain. Next I went to Active Chain control and it worked fine.
(Please visit the site to view this file)