| LS | Title | From | To | Approval date |
| SG2-LS115 | LS/r on TSAG requirement in relation to creation, participation and termination of Regional Groups (reply to TSAG - LS 18) | SG2 | TSAG; | 2019-08-29 |
| SG5-LS97 | LS/r on creation, participation and termination of Regional Groups (reply to TSAG-LS18) | SG5 | TSAG; | 2019-05-22 |
| SG12-LS77 | LS/r on creation, participation and termination of Regional Groups (reply to TSAG-LS18) | SG12 | TSAG; | 2019-05-16 |
| SG3-LS63 | LS/r on creation, participation and termination of Regional Groups (reply TSAG-LS18) | SG3 | TSAG; | 2019-05-02 |
| SG20-LS124 | LS/r on creation, participation and termination of Regional Groups (reply to TSAG-LS18) | SG20 | TSAG; | 2019-04-18 |
| SG11-LS88 | LS/r on creation, participation and termination of Regional Groups (reply to TSAG-LS18) | SG11 | TSAG; | 2019-03-15 |
| SG2-LS92 | LS/r on creation, participation and termination of Regional Groups (reply to TSAG - LS18) | SG2 | TSAG; | 2019-02-28 |
| SG17-LS167 | LS/r on Regional Groups | SG17 | TSAG; | 2019-01-30 |
| TSAG-LS18 | LS on creation, participation and termination of Regional Groups | TSAG | SG2; SG3; SG5; SG11; SG12; SG13; SG17; SG20; SG9; SG15; SG16; | 2018-12-14 |